Out in the car again last night, still tapping, thought it would go away, but it didnt, then, after being stuck in a traffic jam for 45 minutes, i was taking it home, then, it made a funny deep buzzing noise, and started to cough and splutter and not tick over unless i kept the revs up, i got it home, the amount of fuel it was kicking out was crazy, so im thinking maybe a valve has gone, checked all hoses as this is what it felt like and they are all fine, thought it might be electrical, but in all honesty i dont know, so i have a car, that owes me 32k, thats just going to sit in the garage now, grrrr, i hate these things