Recently purchased a used 2002 Mustang Coupe 2 months ago. Car runs great when warm... Lately, very cold start ups though; car stalls at start up while idling, even after revving at 2000 rpm for 5 minutes ... Car stalls at lights while decelerating both up a hill and down a hill coming to a traffic stop. Recently changed spark plugs, wires, exhaust manifold, cleaned the Cold Air Intake Filter, and brought a new fuel filter. Also replaced transmission.
Any suggestions as to what could be causing this??? Guidance would be greatly appreciated.

 

Idle control valve needs cleaning/replacing?

 

Ding!


Also clean your MAF and remember never to touch the wires with ANYTHING other than the cleaner spray stream.