I have a 56 plate Getz that at times looses power and restricts me to approx 5 miles an hour but doesnt affect the revs. I know this is going to happen as the engine starts to feel jumpy and the engine malfunction light either flashes or comes on permanently. This doesn’t seem to happen so much providing I have more than half a tank of petrol. I recently had a new carb fitted and other work done hoping this would sort the problem out. The only thing i haven’t done is get a new exhaust fitted. Any help or suggestions would be greatly appreciated.