My buddy just got to my house right now with his 93 FD and he has no mods besides a cat-back exhaust. He just changed his oil today and now the FD is idling higher then before.... He sd before the oil change it was anywhere between 900 to 1100rpms now it is 1200 to 1400 rpms???? Please give us you input... He did his own oil change... lol

 

i think its like 750- 1000 on stock ports... changing oil should effect that though. check for vac leaks, as you may have bumped something.

 

720-750 rpm is normal...

first thing i would check is the TPS area.. when changing the oil filter he might of knocked something loose around there..