The cause of high engine idle and surges in the 1989 Corvette is due to..Read More
I have 91 chevy k1500, It does this, Sometimes it will idle a few minutes, then jump to high idle and check engine light comes on, And sometimes its as soon as i start the engine... I was told it was a vacum leak, But im no mechanic
check the soleinoid
probably got a bad IAC motor
Check throttle positioning sensor.
ford suck. go Chevy
The idle speed is computer controlled on a LT1 engine. If it is a little high, try checking for vacuum leaks.
engine idle set too high or the timing is off and needs reset.
Check the motor mounts.
Engine idle too high.
you need the fast idle adjusted on the engine you may have idle set where it sounds fine in idle but not high enuff when dropped in gear.
low idle and uneven idle