Truck won't go above 40 and is super sluggish without chip. I replaced the motor about a month back due to a cracked block and it was doing this exact same thing. Only thing that I transferred over were the "throttle body" (whatever you wanna call it), turbo, ac, alternator, fan, and balancer. Had the ECM wiped today and the same thing is happening! Could it be the "throttle body"? Starting to piss me off. Anything helps. Thanks!

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