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Q: Is there a way to test the Throttle Position Sensor? on 2000 Chevrolet Blazer

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My Blazer shifts hard into third gear. Is there a way to test the Throttle Position Sensor or the Transmission control solenoid before replacement?
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Scanner needed, TPS knows nothing about which gear it's in or shifting into, although it will affect ALL gears and shifts!! Again scanner needed to check trans module!
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