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By "too fast", do you mean VERY fast? Does idle speed drop when you turn off the air conditioner? Generally, any sensor malfunction will trigger a code... but not always.
Check the cruise control cable - be sure it's not binding or otherwise pulling the throttle open.
before you go do this simple test
put the hand brake on and start the engine
idles ok --no problem
put your foot on the brake
idles ok ---problem to be found by reading the fault codes
idles rough or stops ---problem brake booster leaking vacuum==replace the brake booster
good units available from the wreckers/junk yards at a goo price
check for vacuum leaks. this can be done by waving a gas torch (propane) near the intake piping between the throttle body and the intake manifold with the engine running.
autozone will scan it for free then give you a print out list of codes, and these codes will give you the names of the parts that are creating errors, replace those parts if needed and then clear the codes and you are done.
Hi,If you are mechanicly inclined replacing the timing belt should be simple ,If the car still runing be sure to aling the timing marks perfect and make a note of the position in a piece of paper,If not you can get the specs at the auto parts where you get the belt ...YES they can jump do to wear and they can cause valves to bend ,this can also cause major engine damage....
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