I installed my DP tuner F5 switch. Everything runs great except when I put it back to the stock tune, the RPM's drop really low like it is going to stall then jumps back up. What could cause this? Also, on my 140 aggressive setting I get no smoke at all. I know i shouldnt get that much because I don't have injectors but I figured I should get some smoke but I dont. Does anyone know why this is? I appreciate any response, I want the smoke! lol.