Hey guys. I'm running the SS M90 kit on my 2001 GT. I originally had an Intense PCM, and it wasn't too bad, but my fuel gauge wasn't reading properly and I was getting some knock retard. I decided to get another PCM which was tuned for all my mods, and for the L67 throttle body (instead of my L36 one). I put them in today, and my car started misfiring on several different cylinders. I also got a P0300 random/multiple misfire code. I'm wondering how this could happen?