My glanza turbo revs would jump from 1000rpm to 2000rpm when i put my foot on the clutch, but this was caused by the oil seal in the crank behind the flywheel was worn and sucking in air!!! i hope this is not the case as if that seal is worn more than likely the bottom end of your engine is F**ked! is your engine making any rattling noise?? need to be bit more specific