When I start my car it idles at
2500 rpm, and then I start driving in first and when I put in the clutch to shift it goes up to
4000 rpm until I go back in gear which forces the rpm down again.
If I stop moving and put the shifter in neutral it will move up to
4000 rpm for about 20 seconds and then drop down to
2500 rpm again.
Any idea what could cause this? I'm baffled
p.s. I've tried resetting the ECU by disconnecting the battery and then holding the brakes for 30 seconds.
p.p.s If there has already been a thread on this here or on NASIOC just link it, I couldn't find any