Dunedain05

Hey everyone. I have a 06 SS/SC. A few months ago I was on the interstate racing a Mercedes (winning) when my car started to sputter a bit and the check engine light came on. I slowed down and just cruised into town. Took it to the mechanic and first they checked my exhaust system, because it sounded like the sputtering was from the back end. Then they found a bad fuel injector. Cant replace just one, so $400 later all were replaced, got them tuned and synced and now the problem is still happening. Any ideas? I am going to change all the spark plugs, if that isn't it I am thinking the coil pack. Hopefully its not a computer problem. The car runs fine, as long as you done have quick acceleration.