Just went to tatton park, fine. Had a walk then back to the car and started up. The idle was really lumpy though, and when i pulled off it just hesitated really bad, rumbling and engine light flashed for a while then went off. I had to slowly accelerated to get up to speed on motorway and so on. A couple of weeks ago i did spray 10k boost into the turbo inlet, and the engine was a bag of **** after that, but then it went ok. So not sure if its the MAF i have disturbed?? or could it be the auto gearbox?