E320, 2001 Model. Engine Revs stays revving high when driven cold.

does it stay at high idle, or come down. If it stays does it seem to coast faster than usual? If so, I'd say it sounds like an air intake gasket More info please

If I am hearing you right, the engine revs ONLY when the clutch is depressed?
I would have to doubt that is what is really happening, tho. Is it possible that the engine is revving from the time that you start it, until the time that you shut it off?
This would be more likely, as depressing the clutch doesn't really have any effect on the engine, other than dis-engaging the drive-line...
IF it is revving at start up, see if it isn't only 'idling down' when the weight of the vehicle puts a load on the motor. In other words, does it idle down, or does it only SEEM like it is, because now it's pulling the car? Do you have to give it gas to go on a flat surface? If not, then it's still revving.
Then, if you decide that it's revving ALL the time, you will need to check it for vacuum-leaks or mis-adjusted linkages, or carburetor (throttle body, if it is injected).
Do yourself a favor and buy a Chilton or Haynes manual for your vehicle (at most any auto parts store), if you plan to keep it for a while. They will generally have troubleshooting sections, to help you eliminate variables until you find the actual issue. It's the best $20 you can spend!

What kind of vehicle ? Which engine? Need more info.

may have a malfunctioning relay in the ac system that causes the engine to run faster for the extra power to run the compressor or the idle speed solenoid mmay be malfunctioning usually mounted on/with the tbi unit..good luck..

To begin with, if you are revving a cold engine to 6000 RPM, you are asking for a blown engine. Most OBD vehicles are equipped with a rev limiter that will cut off fuel at 3000 to 4000 rpm to prevent you from over-revving your engine and blowing it up. If yours is revving to 6000 RPM cold, then the rev limiter, for some reason is not working while it is cold. I have no explaination for this. The best thing I can tell you is to stop revving your engine so high when it is cold unless you really want to see what an engine looks like after is has gone off like a grenade.

jtg

my engine check light on 4age engine dim before start, will not go off after started and slump throttle black smoke from exhaust

you can ajust the engine rpm idle from the idle screw and air flow screw on the intek housing

i have an s10 that would rev up high. i hooked up my scanner and it didn't give me much information, so i started researching. it took a while. i got my manual out and looked up all of the sensors in the fuel system. i even paid some web site $10 for help {wasred my $10} and they were no help. so i researched all of the sensors and found out their symptoms when they malfunctioned. the culprit turned out to be my water temp sensor. here is how it works, when you first start your engine the water is cold, the sensor sends out the information to the brain [warm me up] so your engine idles high to help reach operating temp quicker. when the sensor malfunctions it will send the wrong info to the brain [i'm cold] so the brain revs up the engine in an effort to get warm .i replaced the water temp sensor and the engine is back to normal.

you may have a problem with the idle sensor located near the fuel injection system.