engine miss

[kglowacky]

My LS1 swap has been great running for around 5 years. Yesterday I took it for a ride, and it developed a miss on acceleration and at all speeds. Got my mechanic coming by to place on a computer. The gas is probably 6 months old. Thinking of adding a additive the see if it is bad gas. Any suggestions on a additive? My guess is coil. donor car was a 2002 Firebird trans am

[Willie Makeit]

i'd bet a dollar to a donut if the fuel is that old it has a stuck injector. a quick ODB2 scan will tell you whether it's ignition or fuel related