Uneven idle. No power.

Discussion in 'Engine Performance + Maintenance' started by rydeon, Aug 11, 2017.

  1. rydeon

    rydeon Newbie

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    Long story short. 1990 c1500 rwd 5.7. Recently my truck died on road while driving. Always ran rich before and sucked lots of gas but still got me there. Rebuilt TBI with Diaphragm for regulator etc. Replaced temp sensor in manifold, also new O2. After this the idle surges up and down and almost dies. If i rev the throttle it runs fine. Timing is good. Possible MAP sensor? or IAC? Just also had new stock exhaust system put on. But it ran awhile before this problem. Ok so not so short. This is a 5 speed manual tranny truck totally stock. Any suggestions or laughter would be appreciated!!
     
  2. kennythewelder

    kennythewelder I'm Awesome

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    Sounds like TPS. You need to read your ECM codes.
     
  3. rydeon

    rydeon Newbie

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    Thanks. but the check engine light was on all the time before this and now its off. I do know how to check the TPS with a volt meter so i will try that first. thank you.
     
    kennythewelder likes this.

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