Please help,I have a mk 4 vw golf,1.4 petrol,60'000 miles.the engine used to cut out alot and it was traced to a build up of oil around the butterfly valve beneath the airbox,I was told it was a common fault and was fixed easily.But now after a few months of running fine its began to have trouble starting,sometimes floods with fuel but doesnt start,sometimes starts fine,It also runs rough missfireing and sometimes the revs increase to 3000rpm by itself,I tryed cleaning up this butterfly valve again + tryed putting it on a diagnostic machine but as its intermittant its hard to trace.Please could anyone help us out?

mark burnham, July 2006

try a new coolant temp sensor,they can fail intermittantly,or just tell lies regarding temperature,causing the revs to rise up and down,or poor cold start etc, sensor will poss be a green or blue 4 pin in a housing on the cylinder head

dave p, March 2007