Weird problem need help soon please!!
I have a 03 6.0 with dj sct tuner and worked great for about a month, then the other day i was driving and I noticed that the truck had no power when i punched the throttle. I runs ok when driving under 50 mph, but I have no idea what is going on. I rarely will blow a little white smoke, and will not blow black smoke like it used to with the smoke tune. I put it back to stock and did the same thing. WE unplugged the egr and nothing changed. Takes longer than normal to start, and doesn't show any cel or codes on the tuner. It really won't accelerate after about 2k rpm, and feels like it is cuttingfuel or is being held back by the computer. Any help would be appreciated.