hi peeps, I have a ba 2003 xr6 turbo, had it for about 6 months its stock standard, its got about 134,000kms I drive it pretty hard, lately ive been driving it and after the car gets hot when I floor it it goes hard til about 3000-4000rpm it feels like it starts hitting a rev limiter and wont accelarate any more then it sounds like its coughing out of the exhaust. ive read a couple of other peoples forums and was told to check the coils plugs and cats, ive had all of these tested and had no faults. the only thing that came up in the diagnostics was a oxygen sensor, but they said this would not make this happen. it only seems to happen every now and then, when the car is cold or been sitting for a while it drives normal and feels normal but after a bit of driving it happens again. any ideas anyone? ive got it at the mechanics now checking it out but they cant seem to find a problem?