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Throttle control problems: A sticky throttle control or a malfunctioning throttle position sensor could be causing the high revs.
Ignition system issues: A faulty ignition module or spark plugs could cause the engine to run rich, causing high revs.
Vacuum leaks: A vacuum leak can cause the engine to run lean, leading to high revs. Check for any visible leaks in the vacuum lines and hoses.
Fuel system problems: A clogged fuel filter, a failing fuel pump, or a malfunctioning fuel pressure regulator could cause high revs.
EGR valve: A clogged or sticking EGR valve could cause the engine to rev high.
It's recommended to have a professional mechanic diagnose the issue using an OBD-II scanner to retrieve the error codes and perform a proper diagnosis. Based on the error codes and the symptoms, they can determine the root cause of the problem and recommend the necessary repairs.
Clean the throttle body and idle air control motor. Brake clean and a tooth brush works fine. Clean inside the throttle around where the plate sits and the back of the place if possible. Then start it (it will take a few seconds to start) rev it up and spray the cleaner in the throttle. If you have a MAF sensor, spray it down also. Don't use the tooth brush on it. If you have the throttle with the screen on it, Just start it, rev it and spray it down several times.
My experience has been with later model vehicles, but a bad throttle position sensor most definetly causes this type of situation. Two torx screws, opposite side if the throttle body, should have a three wire plug.
hi,
plug the EGR line and see how it acts. better yet put a ball bearing in that line and reconnect it to the EGR and see if it goes away. definate vacuum issue somewhere. tranny modulator, check every line coming off the firewall manifold. the throttle position sensor might need to be replaced. its one of the only moving sensors under there. on my 89 tempo I could adjust my idle, move that idle screw around so it idles up a bit to get it out of that dead area on the TPS. plug wires after that. those notchbacks are getting extremely rare, and with a V8! put it far far away....
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