Missfire at 3000rpm
I've had a missfire at precisely 3000rpm for some time now, I can rev past 3000rpm from standstill in any gear and it is smooth all the way to 4500rpm which is the max rev I can do.
But the real problem is motorway driving, if I stray over 65mph the engine misses. The miss doesn't happen if you keep accelerating, it seems to be on the run down from say 3100rpm to 2900rpm is very rough and shakes the cars quite allot.
So far I've had a cambelt change with new variator, cam sensor ,maf sensor, crank sensor, lambda sensor, basicly every sensor!
Only thing I can think of left is coil packs or injectors, but if it was either of these why does it miss at just 3000rpm and only rev to 4500, I've tried ecu resets, pedal resets, I have alfadiag showing no fault codes,but the only weird thing I found was the addition fuel trim was at 20,000u seconds while the alfadiag graph only shows a +/- 5000 range, injectors maybe?
Its a 1.6ts cf2 by the way