I called LCE on the MAF and they told me to basically leave it alone unless the engine is really F'd up with mods just like Thief said. I put on the LCE EFI power package along with exhaust from LCE, I messed with the MAF before I called them. Let me tell you something, you really don't wanna mess with it. I went 4 teeth difference from my marked stock location and the flapper would slap open (I could hear it in the cab) with throttle applied fast. The engine would back fire and I could barely make it around the block or down the street. I limped home and set it a couple a teeth closer to stock and drove around it was better but I could tell it was not good, came back home and set it back to stock location and it's been there every since. I will leave it there. Really I should have listen to Darin to begin with, but you know me I gotta learn the hard way. I say leave it alone and enjoy. Plus the EFI will "learn" adjust on its own, I read this in the EFI Tech notes Darin gave me. <img src="/forums/images/graemlins/notooth.gif" alt="" />