Well, i changed that pedal as i said, took it for a run. no joy. The next day i changed the air flow meter and took it for a run, no joy. The next day i changed the air filter (becuase it just needed it anyway). Took it into the garage to go on the machine again and it was just the same as its ever been. He then left it on the machine all night and said it wasnt come up with anything. He then took it on a run and it was absolutely fine. I have just driven 20 miles home and its been absolutely fine. Nobody did anything. It could just come back the next time i go out and we could be back to square one but at the moment its back to normal. Some have said that it can take time for the ECU to 're-learn' anything new put onto it. Is there any truth in that at all? Maybe the parts i replaced did the job and it took the ECU a day or two, or a few miles to 'get with the program'. That doesnt make any sense to me personally but........