about 2 months ago i bought a 06 gto with 77k miles . Discovered it had a big cam & a built ls3 head with a full straight pipe including long tube headers. couple days ago my 06 gto started misfiring while i was on the road, i luckily made it to a gas station. I scan my car and it says that cylinders 2,4,6,8 fuel injectors failed. Any suggestions on what fuel injectors i should get ? or could it be something else ?