hey guys, i got a 1990 fleetwood FWD 4.6L FWD, anyways... i dont know whats wrong but my engine is sputtering while i'm driving, its cutting out.... losing power, and just plain out pis**** me off. it started off only while i was at higher speeds, now its doin it even from take offs and everything else. i gave it a full tuneup and its still doing it... well actually i haven't replaced the spark plug wires... thats my next thing but anyways.... anyone got any ideas?? its got a 122K miles, and is clean. and yeah i run premium gas 91octane, althoughi have used lower grades before. thx.