Russ, I'm no expert, but I've seen others complain of these symptoms and the common consensus seems to be wheel bearings.
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!"
