I have a 2001 GT, NOT ALWAYS but usually only in direct morning under "cold start" conditions I will get a high idle of 1,600RPMS. Now and then if you put it in gear it will drop RPMS and die out. If you restart the mustang right away idle will return to normal. If not about every 30 seconds or so it will drop idle down to 1,000rpm for a short time then go back up fluctuating for about 10 minutes while idling. I have cleaned and tested the IAC and cleaned out all intake related parts. I havn't been able to use my Ford Diagnostic Software because I never have my car in my shop during a morning start. Any idea's?
Also currently it only has 3.73 gears, no tune or any modifications. High idle sound comes from ehaust but you can also hear a drone from the Air housing.
Also currently it only has 3.73 gears, no tune or any modifications. High idle sound comes from ehaust but you can also hear a drone from the Air housing.