Earlier this evening i was proceeding down the M5 near exeter in my work vehicle (Mk2.5 2.0 Focus estate) and all fine.
At 95mph (it's ok, if you check out my profile you'll se i'm allowed to do this) the revs jumped a little, the speed lagged slightly and i left a nice dark grey cloud floating behind my car.
The car carried on fine to 110 mph after that and no problems have become apparrent, car still running well.
Only thing i am trying to figure out is what the hell was it? a misfire or has my car got the farts?