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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?
(1) Answer
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!