I just installed SC 93 tune, full tank of 93 gas, ran fine for about 20 miles on Friday. Then yesterday I installed k&n cai, didn't get to drive it around, so today truck started fine but after about 1 mile started running really rough and (z) lighting bolt thing popped up on lower right instrument cluster. I disconnected battery, for few mins and still runs rough with (z). Any ideas????

 

Fixed it!! It was a piece of plastic broken off the iat sensor stuck in the TB butterfly, not allowing the butterfly to open or close. Just glad the piece of plastic didn't get in the engine!!