So I've had efi for a little while now and on this last tune I have I can't seem to up duration at all without making the truck run like crap at idle. It either lopes or sounds like it barely wants to run. I was woundering if someone could help me out a bit and give me a couple pointers on it. Csp tune 2 lopes and 4 seems to run like crap. The truck seems to run fine on tune 3 which has stock duration. Csp5.ctz