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  1. L

    350 tbi stumbles and backfires under load

    Yeah I got to far ahead of myself and it turned out to be the coil will have to remember that for last time
  2. L

    350 tbi stumbles and backfires under load

    I checked the fuel pressure it’s between 11-12psi which should good I have went over the vacuum system with some slap shot and just visual and found no cracks or leaks, I would I be right o go into the throttle body next?
  3. L

    350 tbi stumbles and backfires under load

    I have checked the fuel pressure and it’s right around 11-12psi so that should be good I didn’t see any drop in pressure with reving, I pulled the vacume line off of the Val cover and it has good suction when I put my finger over it, I don’t have the proper tooling to check the acual vacume but...
  4. L

    350 tbi stumbles and backfires under load

    I will definitely be looking for a code reader, I will have to take a look at the emissions sticker and ensure I set the timing correct, I will look further into the vacume system next time I get a chance to work on it
  5. L

    350 tbi stumbles and backfires under load

    I have double checked the timing at it looks to be good
  6. L

    350 tbi stumbles and backfires under load

    I have changed the fuel filter I’m going to check the fuel pressure tonight and the little screen filters on the injectors
  7. L

    350 tbi stumbles and backfires under load

    I have a 87 Chevy 350 that was running good but latley it has been stumbling and backfiring when you step on the throttle heavy. It revs up fine in park and low acceleration but doesn’t like to accelerate when you step into it a bit I’ve change plugs, distributor rotors, distributor cap, esc...

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