Can anyone help on this one engine misfire on no 1 cylinder, before it came to us it had 3 bosch coils and plugs and a new injector. The compression is ok when it misfires the voltage shuts off on no1 cylinder which i presume is the ecu shutting the injector down, when it misfires if you turn the engine off and start it again it is ok.

The car has been in to the main agents and they have said they need 6 hours to diagnose the problem we have fitted a new servo pipe that was leaking after doing this the vehicle ran fine for a week then started missing again any suggestions John