Does it seem like the engine RPM is actually increasing, or is it a false RPM reading?
You can try a self-diagnostic test. To activate self diagnostic program:
With the ignition switch in the OFF position, depress the TRIP and RESET buttons.
While holding the TRIP and RESET button turn the ignition switch to the ON position.
Continue to hold the TRIP and RESET buttons until the word CODE appears in the odometer windows (about five seconds ) then release the buttons. If a problem exists, the system will display Diagnostic Trouble Codes (DTC's). If no problem exists, the code 999 (End Test) will momentarily appear.
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Thursday, July 16th, 2009 AT 9:07 AM