A used engine is probably only going to have a 90 day or maybe at most a 6 mo. warranty. Anything beyond that is a crapshoot so best to trade it in while it’s still running. Plus, again, the rest of the truck, for instance the transmission, has 116k. Granted, I’ve gone that route with a Pontiac we couldn’t afford to replace that had a bum transmission. It still had the used transmission when we got rid of it many miles later.
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Still don’t what what is wrong with motor.