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engine problems

Discussion in 'GM Powertrain' started by vortec 350, Nov 2, 2012.

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  1. vortec 350

    vortec 350 New Member

    [h=2][​IMG] 94 pickup sbc 350-engine issues[/h]
    Hey guys, kinda new to these forums. I have a 94 chevy pickup that we just rebuilt. Bored 40 over with vortec heads, roller lifters, and roller rockers. When we start the engine it idles and run awesome, but when you go to romp it, it falls on its face. We checked the MAP sensor, rebuilt the throttle body, checked the timing, and checked the vacuum lines. Can't figure it out. I should tell you that this issue was present with the old engine as well. We thot that we would get the new engine in and see if that would help. Not sure if we have a badf computer or fuel flow problems or what. Def could use some help./ Thx​



    Read more: http://www.gmtruckclub.com/forum/showthread.php/103880-94-pickup-sbc-350-engine-issues#ixzz2B4UTYZKX
  2. aloxdaddy99

    aloxdaddy99 New Member 1000 Posts 100 Posts

    Sounds like the ECM isn't adjusting the air/fuel ratio.
  3. vortec 350

    vortec 350 New Member

    YStarted it up this morning and it spit and sputtered and kept trying to die. Kept missing and backfiring. Still the same as I stated above. Was thinking a bad ECM or IAC. Any thoughts?

    - - - Updated - - -

    Aloxdaddy99- did not see ur post till after my post.

    - - - Updated - - -

    YStarted it up this morning and it spit and sputtered and kept trying to die. Kept missing and backfiring. Still the same as I stated above. Was thinking a bad ECM or IAC. Any thoughts?

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