Question about 1989 Chevrolet Corvette

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The car is running poorly and missing when hitting the gas pedal

My 1989 Corvette is hard to start - takes alot of pumps of the gas pedal and then is missing and sometimes backfires on hitting the gas pedal. I've already replace the fuel filter, air filter and PCV valve and that seemed to work for a bit but now is probably worse than ever. It seem like if I run the automatic tranny without overdrive it seems to run a bit better but its driving me crazy. Could it be the mass air flow sensor?

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  • rbodnar339 Apr 14, 2009

    No I have not but they appear to be in good shape and like I said, it runs pretty good when you keep it out of overdrive.

  • mary allman May 11, 2010

    have you replaced distributor cap , rotor , wires , plugs and does plenum have cover over distributor ?

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It's your fuel sending unit.

Posted on Mar 26, 2010

  • chrisjb815 Mar 26, 2010

    check the pulsator located above the fuel pump. when you have the fuel sending unit out, at the top is the electrical plug. If the prongs on the plug are burnt looking, replace wireing harness on fsu. A bad fsu will short out the fuel pump.

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Give it a good tune up. Change the cap and rotor, plugs. Make sure that the plug wires are in good shape and not broken from heat.

Posted on Apr 14, 2009

  • Thomas Kessenich
    Thomas Kessenich Apr 14, 2009

    You have to check the timing. Make sure that the timing marks are lined up with the timing. It might have jumped.

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