Originally Posted by SpaceManSpiff

So, I got my ecu back from InMotion today. I put it back into the car and started her up 5 min ago. The car starts up real rough and is shaking like crazy and then the check engine light comes on. I shut it down pop the hood and start it up again. Same thing, and engine is shaking back and forth like ive never seen it before. What could have gone wrong and has anyone else had a similar issue with InMotion or any ECU tune for that matter. Maybe its something that will go away? Im afraid to start it up again.