Mechanics

CLASS C MALLARD SPRINTER CHEVY CHA

1989 GMC Truck

1989 GMC Truck 85,652 miles

When I put it in park after driving it idles way to high. But after 2 or 3 minutes idles down.
Also when on a straight away and doing 55 mph the engine is running and sounding good, then all of a sudden the sound of the engine sounds like I put it in neautal and reved up the gas.

Got any ideas?
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Dollie
June 14, 2009.



I think your electric or vacuum idle solenoid needs to be adjusted, or lubed, and the other noise you hear is probably the clutch fan kicking in.

Tiny
Mickey-d
Jan 1, 2010.