easttexasredneck

My 1996 K1500 is acting crazy. Reman engine with only a couple thousand miles maybe. Twice rebuilt transmission with less than a couple hundred miles. New distributor with new cap, rotor, and cam sensor. New crank sensor. New throttle position sensor. New fuel pump and filter. Cleaned and tested spider injector. E.G.R. valve tests out fine. All plugs and wires firing at idle. Truck idles great. Runs great till you hit about 30-40 the first time. Then it wants to bog down and miss horribly. When I " get in" the throttle it downshifts and runs great until you ease off the throttle then it starts again. Did not start doing this until shop rebuilt and installed transmission. Somebody anybody please help.