Pontiac Firebird Engine Idle Erratic

My Name It Keith My Dad Is A Mechanic. My Car Is A 1996 Pontiac Fire Bird , Here Lately Is Has Been Making The Rpm's Jump Up And Down And...

The Engine Will Rev Up To 3000 Rpm When Its Cold. Will Not Resume Normal Idle Spped Untill The Engine Is Warm And The Ignition Is Turned Off...

I Really Need Help With This Idle Problem, Wen I Start The Car The Idle Raises Up To 2k Rpms And Raises Up To Almost 3k. I Replaced The Iac...

When I Start My Car It Doesn't Ideal. The Rpm Jump Up And Down And Most Of The Time Stall Out. It Also Does It While I Am Driving And Stop...