Just put truck back to stock and CEL comes on, P0606, didnt know what that was so I fire it up and drive it 40mi, started out surging just a bit and sluggish throttle response for maybe 1-2 mi then cleared up all good runs fine, got home and hooked up smarty and tried clearing that code and a P2A00 which is O2 1/1 what ever the heck that is? I know but I don't anyway neither will clear and truck runs like normal. Should I put tune back on? Wth?? Everything way better when tune is on, maybe has nothing to do with it but I had codes before that wouldn't clear till I downloaded tune and it ran like a scalded cat.