Amazedz
Junior Member
I have an 05 mustang gt with a kenne bell 2.6 stage 1, and comp mutha thumpr cams. After having the car dyno tuned I've noticed a after fire around 3k when cruising down the highway. The car only does it when you slowly increase throttle after holding at steady speed like when your climbing a hill. The after fire is worse the more you press the throttle in. I've changed plugs so far and still nothing.