Hi folks, I have a 1997 c180. The problem is, the car is revving high, it goes to around 2000rpm then drops, it doesnt drop revs intantly it will rev for a short while, it only does this when the engine is at a warm temperature around 80'c. I have also noticed that when i rest my foot over the brake pedal, not pressing it, just shadowing it, when it revs high, the pedal drops slightly, when the revs drop the pedal returns slightly back up. What can this be? Ive looked for air leaks but cant spot any. Any help guys. cheers.