Apologies for starting a new thread

After trawling the net it seems to come back to a whole list of possibilities. Ive added injector cleaner and driven about 250 miles with it in the fuel absolutely no difference.

Has anyone else had a similar problem and solved it. It happens in any gear if the revs are above 2500, might just be coincidence but seems to be worse going up long motorway hills so to me that seems like air being sucked in under more load?

Any further suggestions would be appreciated!! Its doin my nut in not being able to trust the car specially as I have to drive up to Carlisle from Wales in about 3 weeks so about 330 miles!!!

JC