Ford Repair Questions? Ask a Mechanic for Answers ASAP
You probably have a problem in the wiring harness, since you said it changes when you lift the car. Did any wires get pinched or broken when installing?
I would do very close visual inspection of the harness first, make sure all connectors and plugged in all the way. Make sure the wiring did not touch against the cats and melt (have seen this before).