70 K-10 Problems! HELP!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

skyhawk1 · 01-24-2003, 09:19 PM

I need some help please. My son's 70 K-10 starts, idels, revs just fine. However, is has started missing really bad when you drive through town at 25 mph, or start up a hill in 4th gear. It misses so bad that it feels like something is going to break. Now, if you push in the clutch and rev it up it sounds normal again. As soon as you let the clutch out it starts missing again. Again, it starts and idels just fine. Any suggestions? Thanks.

crazy4chevs · 01-24-2003, 09:59 PM

easy stuff first
the first thing i would do is check your ignition for water in the dist or loose wires, then the plugs followed by timming. water in the gas? etc.

hopefully others can add more

jhow66 · 01-24-2003, 10:37 PM

If you still have points sounds like they are burnt and sticking. ( check gap)

70cst10_05 · 01-25-2003, 12:09 AM

check for small cracks in your dist. cap. happened to mine put hei in it and ran like a haas.
kevin

meathead95 · 01-25-2003, 12:14 AM

are you sure the clutch isn't slipping?

Dads72 · 01-25-2003, 12:41 AM

Replace the plugs. It can't hurt.
My truck was chugging like an old plow horse when it would try to go up a hill. Found one bad plug. That fixed it.
I "think" some of the gunk you might find on the plugs is caused by the additives they put in the gas at some stations.
My bad one was at the rear passenger side.

Dads72 · 01-25-2003, 12:43 AM

Forgot something.
I have a mild RV cam in my 350 (360 now)
It sounded mean at idle - until I set the idle screws.
One side was lean. Opened it up a bit and it purred like a kitten.
That was on the same side that I had the gunked up plug.

O'l Buck · 01-25-2003, 02:27 AM

Last time mine acted like that, the distributor cap was carbon tracked really bad.

skyhawk1 · 01-25-2003, 07:39 AM

Thanks for all the tips. We are going to check the HEI distributor today for loose wire and maybe take the Holley off my 71 C-10 and put on it to see if its the carb. By the way, the truck has new plugs and plug wires, HEI distributor, we've recently put in new lifters, push rods, and we adjusted the valves by the book. Thanks again.

casey · 02-01-2003, 11:12 PM

That exact thing happened to me, it was the fuel filter

01-24-2003, 09:19 PM	#1
skyhawk1 Registered User Join Date: Dec 2000 Location: Oceana WV USA Posts: 184	70 K-10 Problems! HELP!!! I need some help please. My son's 70 K-10 starts, idels, revs just fine. However, is has started missing really bad when you drive through town at 25 mph, or start up a hill in 4th gear. It misses so bad that it feels like something is going to break. Now, if you push in the clutch and rev it up it sounds normal again. As soon as you let the clutch out it starts missing again. Again, it starts and idels just fine. Any suggestions? Thanks. __________________ "The World's a Mess"! 71 C-10 72 Suburban 2WD Oceana, West Virginia

01-24-2003, 09:59 PM	#2
crazy4chevs Registered User Join Date: Oct 2002 Location: Des Moines WA. (Kent, area) Posts: 668	easy stuff first the first thing i would do is check your ignition for water in the dist or loose wires, then the plugs followed by timming. water in the gas? etc. hopefully others can add more __________________ 70 chev c10 swb fleet 72 grill, sb 400, 2/4 drop. 68 chev c10 swb fleet Early classic 4/6 drop with 4wheel disc brakes 9"rear 67-8 buckets tilt and A/C Classic GM Truck Club of Washington . Last edited by crazy4chevs; 01-24-2003 at 10:02 PM.

01-24-2003, 10:37 PM	#3
jhow66 Registered User Join Date: Jun 2002 Location: Knoxville Tenn. Posts: 3,058	If you still have points sounds like they are burnt and sticking. ( check gap) __________________ 56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer

01-25-2003, 12:09 AM	#4
70cst10_05 Registered User Join Date: Dec 2002 Location: Summerfield, Ks Posts: 748	check for small cracks in your dist. cap. happened to mine put hei in it and ran like a haas. kevin __________________ 1970 Chevy CST/10 1970 Chevy CST/10 1972 Chevy C/10 1972 Chevy Suburban K/10 2019 Silverado 2500 Duramax Kevin

01-25-2003, 12:14 AM	#5
meathead95 computer illiterate Join Date: Jan 2001 Location: Des Moines, IA Posts: 6,440	are you sure the clutch isn't slipping? __________________ 72 2wd blazer 72 swb 4x4

01-25-2003, 12:41 AM	#6
Dads72 Registered User Join Date: Nov 2002 Posts: 427	Replace the plugs. It can't hurt. My truck was chugging like an old plow horse when it would try to go up a hill. Found one bad plug. That fixed it. I "think" some of the gunk you might find on the plugs is caused by the additives they put in the gas at some stations. My bad one was at the rear passenger side.

01-25-2003, 12:43 AM	#7
Dads72 Registered User Join Date: Nov 2002 Posts: 427	Forgot something. I have a mild RV cam in my 350 (360 now) It sounded mean at idle - until I set the idle screws. One side was lean. Opened it up a bit and it purred like a kitten. That was on the same side that I had the gunked up plug.

01-25-2003, 02:27 AM	#8
O'l Buck Recovering Truck Driver Join Date: Mar 2002 Location: Orleans, NE USA Posts: 1,883	Last time mine acted like that, the distributor cap was carbon tracked really bad. __________________ 67 K-20 350, SM465, Eaton rear, 4.56 no spin option 00 Dodge 2500 4x4, 24V cummins, 5 speed Chad South Central Nebraska

01-25-2003, 07:39 AM	#9
skyhawk1 Registered User Join Date: Dec 2000 Location: Oceana WV USA Posts: 184	Thanks for all the tips. We are going to check the HEI distributor today for loose wire and maybe take the Holley off my 71 C-10 and put on it to see if its the carb. By the way, the truck has new plugs and plug wires, HEI distributor, we've recently put in new lifters, push rods, and we adjusted the valves by the book. Thanks again. __________________ "The World's a Mess"! 71 C-10 72 Suburban 2WD Oceana, West Virginia

02-01-2003, 11:12 PM	#10
casey Registered User Join Date: Jan 2003 Location: Kelowna B.C. Canada Posts: 2,048	That exact thing happened to me, it was the fuel filter



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