Thanks for the info

The fault is on permanently on the Rear Cylinder now and the idling is hunting at around 1800 revs until the car is stationary when it drops down again.

Fitted a new fuel pump a while back so I’ll rule that out for now.

Baffles out and new air cleaner fitted about a1000 miles ago and no faults until now.

I’ll start with the intake seals first and go from there I guess