funny idle
 

when i start my car it idles fine at 1,400rpm's when its cold and at about 800rpm's when its warmed up, but as soon as the car rolls( even without pressing the gas peddle ) forward or back it idles at 2100 until the car coms to a complete stop then it idles from 1,000 to 2,100rpm's erradicaly for about 30 sec then it drops down to about 1000rpm's. i am thinking it might be my ecu. originally the ecu was an automatic p30 and i chipped it with a mugen program.
the motor is a 1998 jdm b16