guys, got a major problem with the car. We were driving back from southend when suddenly the car started to sound really rough and didnt seem to have the power. We pulled over and it was running very very rich as our flame kit was lighting it all. Anyway, we switched car off for a while, sat there, drove away, same thing. All of a sudden, the power kicked back in, car sounded great and no probs at all. So we drove about a bit to check all was ok, then boom, it happens again. We pull over, switch off engine, start up 10 minsd later, its perfect again. Get home, leave it on idle for 15 mins, and there she goes again. WHAT IS WRONG PLEASE HELP!!!