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Have you checked for any trouble codes in the PCM (engine computer)?
You can still have trouble codes without a check engine light being on.
See if you can do a KOEO (Key On Engine Off) self test and also a KOER (Key On Engine Running) self test with the OTC code reader. You can reply back when you have tested for trouble codes. Just post the reply on this page. I will be on line late tonight and tomorrow afternoon.