youre ecm may be in "limp in" mode.normally when your ecm loses contact with a harness, it will go into limp in mode, which is a term used for a preset running mode.all your computers communicate on what is called a bus wire.if this wire is broken anywhere along the harness, you can lose all regular functions or run like shit.all along your harnesses,pull off the conduit surrounding the harness and check for broken or frayed wires.if this is the problem, you can half ass it and sodder in a new piece of wire or go all the way and replace the whole harness. i work at plant city chrysler dodge and jeep and i see morons trying to wire gauges in to there harnesses and frying pcms and harnesses all day long.Good luck buddy... keep me posted.