Ok here we go.
Brother has just puchased a VR6 corrado (1992 VR) and it has a slight miss fire but seams to clear when its warm until you put your foot down a bit.
I have replaced the rotor arm, dizzy cap, plugs and leads. car starts ok but a soon as you rev it hard it starts to miss and stays missing. Traced it to cylinders 5 & 6 and both have a spark. When it's ticking over and missing there is no smoke just a smell of fuel.
I tried to start it and left it on tick over for a while until it was warm. Went for a drive and all was well and the miss fire when pushed has now stopped. went to visit a mate and the car was left for 30 mins and was still warm when re started and it performed as it should.
Went to start it tonight when cold (starts fine) no miss fire until it was reved.
Thinking it could be the temp sensor ????? as it may be over fueling when cold.
Any help woud be great.