i did a 6 hour road trip with my turbo ls in my hatch. it went fine. no problems at all no smoke no weird noises nothing. i changed my oil before the trip..checked the levels it was fine. i come home to drop off my suitcase and rest for about 20 min..then go off to the mall. go in the mall for about 2 hours. come back out and its missfiring horribly..sounds like a wrx i tried to drive it but it has like zero power and then just shuts off. what could this be? i didnt beat on it or anything.