Mine will drop revs slowly on occassion. I haven't been able to determine the cause, but I'd guess it has to do with all the emissions control stuff.
125.2 FWHP - 126.5 FWTQ SVT exhaust (#4 of 9) - B&M FPR - Custom CAI - bnoon optimized TB #1 & 2 (beat that!!) Black '98.5 SE Zetec MTX Best quote seen in a chat - "Jinx 12345678910 you owe me a naked picture of yourself!"