Rough running 85 c10 problem

[cardreams]

Hey guys I have a very weird problem with my stock 1985 305 truck running fine at an ideal and when I rev up in park and when I first start driving it but then after a little bit it will start running like its trying to flood it self

I have put a brand new stock carb on it and it does the same thing any help would awesome because this is really bothering me lol

[flashed]

Your Cat converter on the exhaust may be stopped up may .On one I had many years back had the same issue ,I took the exhaust loose at the manifolds and it ran normal .Worth a try .

[cardreams]

Not sure if that's it or not I've had it almost make a tic noise and then it starts running rough and feel like it's flooding it self

[barry1982]

Are you sure it's flooding? Notice any blue/black smoke out of the exhaust when it's doing it? Maybe a heat related spark issue. A bad coil sometimes runs great cold, than crappy when it warms up. Also had a 76 that ran fine cold, than very "erratic" after it warmed up. Took me forever, but finally figured out it was the small metal contact that is riveted on the end of the rotor. Cold the plastic contracted keeping the contact solid. Engine warmed up, plastic expanded, and the contact loosened enough to not hit the distributor poles properly.

[allengator]

Originally Posted by barry1982

Are you sure it's flooding? Notice any blue/black smoke out of the exhaust when it's doing it? Maybe a heat related spark issue. A bad coil sometimes runs great cold, than crappy when it warms up. Also had a 76 that ran fine cold, than very "erratic" after it warmed up. Took me forever, but finally figured out it was the small metal contact that is riveted on the end of the rotor. Cold the plastic contracted keeping the contact solid. Engine warmed up, plastic expanded, and the contact loosened enough to not hit the distributor poles properly.

+1 for ignition problem...

bad cap, rotor, wires, coil, or module (in HEI) can do this!

Anytime an engine is running erratic I check those first!!! 9 out of 10 times its cap/rotor related!

[cardreams]

Hmmm thanks I never thought to check the cap/rotor

I'll try that guys thanks

[cardreams]

And yes it does have black smoke when it runs like $hit that's why I thought it was something to do with the fuel system