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  1. Starts, Idles, and Runs fine but stumbles bad in o/d....help!!!

    99-03 7.3L Powerstroke Problems
    Hi there I'm new to the forum. I've got a 2001 psd and I can't figure this out for the life of me. It starts great even at -20 last week, idles smooth and runs good until you accelerate in o/d as much as you can without downshifting it will start stumbling bad and then come out of it. It won't...
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