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Old 11-10-2016, 09:30 PM   #9
TJ's Chevy
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Join Date: Mar 2013
Location: Southern Oregon
Posts: 10,384
Re: 1978 454 missing/backfire

Quote:
Originally Posted by Tony S. View Post
Okay, I checked my plugs and the gaps were at about 60. Is that normal? I re gapped them to 47. Also, my timing seems to be jumpy? What causes that? My vacuum advance is new and working fine. I can't bind any other vacuum leaks? This thing starts right um and after about 2 minutes sets at a steady idle of 550-600 but as soon as I try to give it any fuel it has hesitation and continues to hesitate even at a steady speed? If I'm rolling down the road at 25mph holding it there it's slightly jumpy and when I give it gas it's even a bit worse with the hesitation? Anything helps...
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Like Geezer mentioned, possible lack of initial. Do you have the vacuum advance on Ported or Manifold?
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