i have a 2.0 AT mystique with 92k miles.

when my car is in drive and is at idle the rpms sit at just above 500 and sometimes go below 500 and stall. when its in park or neutral it sits fine at about 800. ive noticed this problem for awhile now and dont know what to do..... any ideas?? thanx guys


1996 Mystique 2.0 GS Zetec AT Cold Air Intake, DTM Exhaust, Fog Lights, 6 Speaker Sound System Powered By A Awesome Kenwood CD Player. 215/40/17's with Shinwa 7 Spoke Rims!!! 92K miles 1985 (rare) Mitsubishi Starion Turbo