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Rpm idle.

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Old 05-07-2016, 12:05 AM
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Default Rpm idle.
99 silverado 1500, after driving my truck for a while when I put in park it doesn't idle at 500Ish like normal, it will sit and indeed at 1000rpm. Why is that? Is something wrong?
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Old 05-07-2016, 11:13 AM
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Vaccum leak maybe?

Dirty throttle body and IAC??

I'd maybe take it apart and see if it's caked up with EGR gunk or just really dirty from not being cleaned.
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Old 05-07-2016, 12:16 PM
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Check the vacuum hose on the fpr as well they like to get brittle and break...have also seen broken wires at tps connector cause idle issues
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