Back firing through TBI and transmission not shifting out of first gear while driving

I have replaced plugs wires cap rotor shift solenoids and wires in transmission, ECM new, fuel filter new, injectors, new fuel pump, and it still will not shift out of first when going down the road. It falls on its face off the line and backfires through the tbi only on the passenger side of the tbi. It didn't do it every time I drove it until just recently. Oh, and the TPS has also been replaced. Please help, and thank you.