Idle Problem

My idle jumps up and down randomly. It would be at 1000 then drop to 500 then up to 800 then down to 200..... What would cause this?? Anyone else have the same problem?? If so, how did you fix it?

search the forum. this thread is covered weekly.

ok, one more thing though... say im driving and I put my car into neutral to stop for a light.. the RPM's stay where they are for about 10-15 secs... then they drop... any suggestions what might be wrong??

vac leak, iacv, uneven compression, head gasket, etc. trust me, the search will show you alot of scenarios and will help you pinpoint the problem.