Revs have always rised. Ive got an ocasional judder though.
One day they may make it so it zaps your gonads if you drive around with your foot resting too heavily on the clutch all the time
The simplest answer is that it tells the car when the clutch has been depressed and then it's up to the manufacturer to decide what they want to happen with that info.
On some cars then the starter won't be allowed to engage unless the clutch is depressed
On others it disconnects CC
It may be used to keep rpm up for smoother gearchanges, on others if you select "Sport mode" it may put rpm even higher during gearchanges
On some with auto engine shut off in traffic jams then it engages starter when you depress clutch
One day they may make it so it zaps your gonads if you drive around with your foot resting too heavily on the clutch all the time
Juts a quick update
I completely removed the clutch switch today, drove around for a few miles and unlike shadeyman`s OK experience, mine was quite bad, clutch compression and gear changing was clunky and it definitely mad it worst
As for the unsual throttle experiecne, it was still there so the switch is going back on for now, if I can I will be plugging in to the ECU today or tomorrow and try to find some error codes.
I wonder why I got a different result to you.I'll be trying it again later today. I'll connect FES to the body computer and see if I get any error codes there as there were non in the engine ECU.