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Old 07-22-2012, 12:20 PM
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It could be built into the Computer.
Look athe wiring harness for the engine sensors. There could be a tiny vacuum hose in it. That will go to the computer as the sensor could be built in. Those early years were a formative bunch for GM as they didnt have it all together, so it can be a guessing game.
Most of the time the sensor is underhood.Many years they were mounted on the air cleaner housing
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