Engine runs excesivly fast,it can rev up to 3500revs by its self,had it in garage couldn't find the fault as it happens intermitently.From cold engine runs at 1800 revs after a short while it will go down to about 1200 revs,when the clutch is dipped the engine revs excesivly until the gear is engaged.The rev counter stays high until clutch is let out it does not drop off until the clutch is let out between gear changes.
Any help apprciated.
Gav B