What does it mean when a 1998 mark VIII is idle and the rpm's jump erratically up and down?
It sounds like the IAC valve which is very easy to change on the 97-98 models but first check to see if there is a vacuum leak. Hope this helps. The IAC is the Idle Air Control valve and is on top of the intake manifold driver's side.
On a 1991 Nissan maxima Idle is good at starting car then the idle goes up high for a while then is up and down?
What could be wrong with your 1986 Oldsmobile delta 88 if it dies when I stop and idles erratically?
Might be the throttle Position Sensor or switch - causes it to idle erratically - jumps up and down in rpms. Got one the other day for a different type of car - was about 50.00. Not sure what engine you have - so don't know how to tell you to locate it. Might have your mechanic check that out - see what he says.
1993 Oldsmobile acheiva 2.3l quad idle low and erratically engine will shut down sometimes when at a complete stop will also idle erratically while mantaining a speed we are clueless help only vehicle?
Check Vacuum lines Also I think there is a "plate" kind of deal on the top of the engine that connects the spark plug wires to the plugs (it lifts off in one piece) and sometimes one of these connectors cracks ( probably due to heat) and that may be the cause of your problem - niot running on all cylinders all the time
What could cause a 1998 Buick Park Ave Ultra-bucks and stalls when started and idling-fine when accelerating?
What does it mean when your car's engine races revs up and down while it is warming up in the morning?
When an engine is warming up the car may idle erratically. This happens because the air may be to cold and the colder air will cause abnormal combustions to ensure in the engine. The computer is set to make the engine function under certain conditions, such as having the engine operate at an optimal temperature.