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Code P056 on 1995 Seville STS

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I NEED HELP! My '95 Seville STS runs only 1 current code -P056-. It is running like crap, erratic idling, missing at all speeds, & down to 8 mpg's. Parts places tell me it's oxygen sensors. Repair places say it's major tune-up probs & dealer is telling me P056 means several things (namely a list of things to start replacing until you find the bad component, plus $85 hourly labor charge). Has anyone dealt with a P056, where it WAS the 'transaxle input speed sensor circuit problem'?

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