i have an 02 alero with a 3.4 l v-6. It surges when changing gears and in gear, but going up hills. I have had the Pressure Control Silindiod changed in the transmission, new wires, new plugs (bosch platinum), new motor mount. Any suggestions as to what to do next?

Optional Information:
2002 Oldsmobile alero 3400 V-6

Already Tried:
plugs, wires, motor mount, Pressure Control Silindoid, MAP sensor.