7.3's are pretty particular on using motorcraft ICP and CPS (few different ones, I use this with a cheapo backup in the glovebox) sensors. If it still runs bad w/ ICP unplugged, the ICP isn't your issue. But once you get the truck running I would recommend replacing the ICP with a motorcraft sensor, and keeping the other in you glovebox in case of an emergency. To be short, the aftermarket sensors are junk, short life span, and inaccurate readings, but work in a pinch.