Well folks! I took off ICV and the gasket looks like it wasn't sealing around the hole nearest the electrical plug end. It looks as though the gasket had been pushed upwards slightly when being assembled and part of it was overhanging into the hole in the manifold so allowing air in. This may or may not have been the case as you can't surmise that is what was going on.Any way sealed now and at the moment seems better, I will have to give it a run on the m/way to check,all being well it is sorted.ps it has only done 56 thou ish.Thanks all.