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Thread: 89 idle issues

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    Default 89 idle issues

    I have an 89 Sierra, 5.7. auto,When I first got it it had very hi idle. I replaced base plate gasket nad idle air control valve. It ran fine for about a week. Now it idles rough , especially in drive with brake on. I have replace plugs, wires, cap and rotor, Fuel filter . No change..any advice appreciated.No service engine light and no vacume leaks that i can find..
    Last edited by k9ulan; 05-12-2012 at 01:01 PM.

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