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Auto trans will downshift sometimes all the way while at freeway speeds

(1999 Saturn SW2)
in San Bernardino, CA on November 14, 2016
Cycling on/off brings it back quickly. Feels like computer, not valve body. When this happens it brings up the check engine light and it won't shift right for days. Then every thing is fine for a while but not long. Is this my engine CP running amuck? You never know what or what starts it, but switched off to on brings it back to default and runs poorly.
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Popular Answer
Hi William: Sounds like a more complicated problem that may be causing poor drivability and shifting concerns. Its going to take the right testing equipment and experienced ASE Tech to get to the bottom of this problem. Feel free to give us a call and set up an appointment so we can help you with this. Sincerely Ultimate Performance Team
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