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It is a good idea to remove the throttle body and desludge it. There is a device on the throttle body called the idle air bypass which maintains idle speed and generally gets clogged up with carbon. It might also be a crank positioning sensor. The GM 3.8L engines had a common problem with the crank positioning sensor getting wet and giving a false signal to the engine. You might want to clean the crank sensor with electrical cleaner and make sure it is sealed and seated properly.
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
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