Need some help. I recently bought an '04 Mustang but am having idling problems. I've looked up some things on the Web but they didn't do anything for me.
I've clean the IAC and it helped some but not much. 1100 rpm to 800-1000rpms after cleaning. In park it stays at 800-1000 rpm. In D it drops to between 500 and 750 rpm but the idle goes up and down it never smoothes out.
It rattles when you smash the gas and rear feels jerky like the differential is worn out or needs oil. Also, when you put it in D without pushing gas you're going 30 to 35 mph.
I need some help or opinions, thanks.