Hey, you should have checked the circuits at the tps before replacing anything. I'm not sure of your engine litre size, I lookled at 3.9L.
At the connector, the violet wire with white tracer is ref voltage, about 5 volts, key on. The black wire with lite blue tracer is ground. The orange wire is tps signal. You should be able to use digital multimeter on the tps signal wire, key on, Move throttle up and down, see if voltage rises and falls smoothly.
Some possibilities to check as far as insufficient engine power.
Fuel injector issues
ait inlet restriction
coolant temp sensor
cam and or crank sensor
ignition and coil circuit
Wednesday, November 21st, 2012 AT 9:52 PM