Mechanics

CHEVY LOW IDLE WHILE I DRIVE.

1992 Chevrolet Silverado

Engine Performance problem
1992 Chevy Silverado V8 Two Wheel Drive Automatic 136600 miles

would a bad ecm cause low idle while in drive on a 92 C1500 5.7L? Truck has been sitting for about 6 years. I've replaced fuel tank, fuel pump, fuel filter a complete tune-up including the ignition module and coil pack. Also replaced was the iac valve thinking that would help with the low idle. The warmer it gets the worse it seems to get 200-300 rpms. Idles fine while in park 600-800 rpms. Please help I'm stumped!
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Ampdfore88
March 29, 2010.



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