idle surge when warm

I just got my 92 eagle talon 2.0 N\A about a week ago... now heres the bummer... it starts fine runs well revs nicely but once the temp reaches normal opperating temp and you rev it ...or come to a stop light... and take you foot off of the gas... the motor rapidly revs between 1200 and 2400 rpms about 1 time per second... i had a mechanic look at it and he tested 2 different sensors and said they checked fine and said it had to be the computer... so i got a new one of those and it still does it.... i have no clue what to do and im starting to get frusterated please help me

im pretty sure every DSM has that same problem. every one ive had and every one ive driven has done that sooner or later during the drive.

only thing i can think it would be is something is wrong with the fuel system

My 1992 Talon did that for awhile. Since my battery had died, the service people mentioned the computer needed to be reset after having lost the power connection. I later discovered, it was the idle speed screw. Over the years, the rubber O-ring became too dry, causing the screw to become loose. Eventually it fell out, and the car began stalling at all stop signs/traffic lights. A simple $4.00 (Canadian) plastic replacement idle speed screw resolved the problem.

Here is more information on "Idle Surge"...

http://www.dsm.org/archives/1997/04/19970409.txt/8.html

http://www.dsm.org/archives/1998/02/19980213.txt/32.html

http://www.dsm.org/how-tos/tttt/tttt3.html

you guys are great on here,,, looks like im not the only one with a troubled dsm... ill give this stuff a shot! if nothing works ill get back