I posted before about a miss I was having while cruising. I still have it and I am almost out of Idea's. My truck missing usually while i am cruising between 1200 and 2000 RPM's. It happens ofte, but not consistantly. So far after I started having the miss I have changed the TPS sensor, Ignition module (holley module), ignition coil (MSD blaster TFI), Plug wires (ford racing 9mm), I cleaned the Throttle body, I also went around the vaccum lines with a propane to check for vacuum leakes as suggested and I didnt' find any as far as I could tell, I cleaned the IAC(I just sprayed some cleaner and rubbed around in there), I have run some STP fuel injection cleaner in the gas. I checked the plugs yesterday which are fairly new and they were all gapped way to big and they where white. The things I had changed recently before I started having this miss a few months ago where the fuel filter and the cap and rotor. I started to check the ignition wiring, but I am already confused by it. I checked the harness going to the coil the hanyes manual says it should be getting 8 volts to the coil(if i am readign it right) i was getting 12. Is that right? I also checked the codes and I don't have any now. THe only code I have had since the miss, was when the check engine light came on for about 5 minutes. when i got home i checked the codes and if i interpreted it right it was insuficient EGR flow. Since then i have had no more lights or codes. With eveything that I have done the truck keeps running better and better, it just has this random miss. Any help is much appreciated.