I have a 2014 gt that I swapped a Tremec t56 magnum xl into. Since then it's been throwing multiple misfire codes. P0300, 304, 307, and 316. I replaced spark plugs and coil packs on all 8 cylinders. Still threw the codes so I did some forum reading and others have said that they had to get their pcm reflashed, so that's what I did. The dealer I took it to also performed a throttle body cleaning service. On the way home from the dealer, CEL starts flashing again and throws the same codes. Are...

Misfire after trans swap