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Check all wires and plugs going into and out of the tranny,You must have bumped something while working on the manifolds. Check any vacuum hoses if any are going to tranny.If it was shifting fine I think you hit something. What else did you work on.????I know those manifolds can be a PITA. Check that EGR works properly some of the new ones need a bit of back pressure to work.Some headers won't give much backpressure,just make sure EGR is working ok. MIKE |