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Message: <blockquote data-quote="INW-Iron-Steel" data-source="post: 21593" data-attributes="member: 11733">Did the harness potentially get stretched or pinched when removing/installing the transmission?Also, what all did you disconnect? I would go over anything you removed/disconnected and reinstalled again. Be diligent about checking ALL of the grounds. After that, I would trace the injector and coil wiring harnesses back to their source in the main harness. A very common cause of the P0300 multiple misfire code is a poor ground at the coils. With that, and the P0200 code, it sure sounds like the harness got pinched or maybe a ground wasn't reattached.Hope you find the issue, and welcome to the forum!</blockquote>