engine power loss light keeps coming on
First Mini told me it was a winter chill factor in that there has not been a recall repair for it yet. The light came on a few weeks ago and the engine started shaking. I had the fuel pump valve, pistons, spark plugs, and coils replaced. The light has come on again after all the repairs. What else could be causing this? I have problems when the car is below 4000rpm mostly, and cold I guess.