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My 1993 2wd 460 e40d pcm went bad....replaced the pcm with a used one and all engine symptoms returned to normal.....when the pcm went bad the truck went into limp mode and shifted really erratic...(early shifts)...checked harnesses,plugs, wires ....from plugs on end of harness to pcm no problems at all....replaced abs sensor in rear end and mlps....no change....I have a few codes so here they are ....622,633-dont understand this one as I do not have 4wd.....411&412...replaced solenoid pack as well but old one tested good...any suggestions????