Originally Posted by H20boy

thought I didn't quote the OP, I was addressing the part about Being a new purchase, and new owner/driver (coupled to the female pursuasion) I took a stab at the lower grade gas as an obvious potential cause.

Oil gets sucked into the air pipe in the older gen cars through those part and full load breathers, cleaning the MAF is more important I belive on those earlier 4.0s than our 4.2s though.