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cant figure this out (engine problems)

Discussion in 'The Garage' started by Jonny-K5, Sep 17, 2004.

  1. Jonny-K5

    Jonny-K5 1/2 ton status

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    what could causs this: at first start up motor runs great, 5 minutes of warm up and its missing and sounds like its got fouled out plugs but there not. doesnt go back to normal til its 100% cold. its a 1977 350 chevy w/ HEI. its got a manual choke carb so thats not the problem. it does sound similar to a sticking choke. im thinking maybe the coil. what do u guys think?
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Have you checked or replaced your plug wires lately? The wires might have too much resistance once the engine gets warm.
     
  3. Jonny-K5

    Jonny-K5 1/2 ton status

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    hmm, thats possible, they are a pretty old. i remember we had an old outboard boat motor that would fire right up, but once it heated up it ran like crap. turned out to be a cracked coil. thats why i thought it might be the coil. i should just do a complete tuneup and see if that helps. any other ideas?
     
  4. Jonny-K5

    Jonny-K5 1/2 ton status

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    Re: cant figure this out (engine problems)**FIXED**

    well, i threw on a new cap,rotor,coil and plug wires and the thing runs like a champ /forums/images/graemlins/thumb.gif time to go burn some rubber!
     
  5. Corey 78K5

    Corey 78K5 1 ton status

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    Possibly a plugged catalytic converter.
     

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