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Is your check engine light coming on/
Have you checked for stored codes?
You can easily read manual codes on that car. Here are the codes and the procedure.
Self-Diagnosis Indicator:When the PGM-FI warning light has been reported on, turn the ignition on, move the front passenger seat to the rear position and observe the LED on the front of the ECU. The Red LED indicates a system failure code by blinking frequency .
If LED indicates CODE 2, 4, 11, or exceeds 14, count the number of blinks again. If the indicator is in fact, blinking these codes, substitute a known-good ECU and re-check. If the indication goes away, replace the original ECU.