my lumina 2002 ltz engine problem
the engine RPM going up and down position when car is neutral what is the problem and
how can fix it
There could be several causes, but first a better description is needed. How much time elapses between rpm changes...seconds or less...minutes? Also, how drastic are the changes and do they go from what seems like a normal idle to a high idle or to a low idle...or both ways. Does it almost stall at any time? Has this been a one tank of gas problem...it could be as simple as bad gas or a clogging fuel filter.
if you don't run the right octane fuel in your car, you could mess the idling sensor up.
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