hi mick i have romoved the thottle body & cleaned in out also reset after. but i have not as yet tryed the air mass yet as all live dater was showing ok i didnt want to spend any more money unless i was 100% because we are over £2000.00 so far just to relate to the post from pete we ckecked the injectors but it runs the same on gas to no different misfire on no3 & no4.