Question about 1986 Chevrolet K1500

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I have a 1986 checy 4x4 , plugs replaced, fuel filter air filter...Idle is really high and now after i let off the gas pedal is still goes around 80 km's, and will not slow???

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  • elwood sherman May 11, 2010

    Is this a carburetor or fuel injected model?

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  • Chevrolet Master
  • 1,000 Answers

If this is a 4.3 liter V-6, they are notorious for throttle body to intake manifold gasket air leaks.
You can use a long piece of heater hose or air hose to find the vacuum leak. Place one end of the hose to your ear and use the other end to search for the leak. Move the hose over the engine while engine is running and listen for a "hissing" sound.
Repair the leak, disconnect the negative battery cable for 3 to 5 minutes, start the vehicle and drive or 45 mph for 5+ miles. The IAC will relearn and the idle should return to normal.
Good luck, let me know.
Regards,

Posted on Jun 17, 2009

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