Booting the old girl in third 6500 revs change into fourth 85 mph. Foot down and nothing, car starts to slow down. I pull over and cant seem to get it out of gear. Let the clutch out and the revs creep up to around 4000 revs. Clutch in and she idles fine. I then manage to get it out of gear and put it in 1st. I pull away slowly thru' the gears and (touchwood) shes been fine since. Strange eh?

 

Sounds strange no idea sorry lets hope it was a one off.
Fuel block etc