Nate:

Now THAT'S weird. You shouldn't be running the 19#ers on the 24#-calibrated MAF, but that would make you run LEAN (injector pulse width shorter because of the 24#ers more ample fuel delivery).

I now can't imaging why you're running rich and/or fouling... Try the stock MAF for as long as you're running the 19#ers... See if that makes a difference.

Dan G. and his Cougar Forged internal (Diamond & Pauter) full 3L, "Monster" Kinger F/I cut & P&P, T3/4 60 trim .82A/R ADC turbo, SPEC Stage 3, Torsen, Greddy Profec-B SPEC II, Apex'i Timer, Lots of Gauges! Used to have: 3.0L SVT hybrid