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code 12 is always present in gm motor products. it simply means no tach signal because engine is not running. i would go with the simple first and clean the throttle body real good . that takes care of 99% of idle problems.
as long as width , lug pattern and drum or disc match up will work , if ratio differs fuel mileage issues will occur , should be rear end code in glovebox for refernce
transmission gone bad or low fluid if leaking,you still need to know what the code means ,does the check engine light is on,but doesn't seem to be the engine.
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