I recently switched from a Holley Commander 950 DFI setup to a stock Mass air system and I am having a little trouble with it. The reason I went to stock over DFI is a LOOONG story, and dont want to bother you guys with that crap. Okay, the car runs fine at idle, and at full throttle (during open loop) but runs dead lean under closed loop conditions...pops, backfires, etc....what did I not hook up right?

 

none of you Ford guys know the answer to this???