Scanned for codes, it didn't have any. I'm thinking the lights and the rough running engine could be separate issues. I lifted up the carpet today, opened the access port to the top of the fuel pump and listened as I had someone turn the ignition. The fuel pump sounds extremely faint, I could barely hear it even though my ear was 8 inches away from it. Other times it wouldn't make any noise at all. Checked fuses and relays, all work. Truck has 130,000 miles. My theory is that the fuel pump is getting weak and may be failing. Would explain why the truck starts but under driving conditions, it begins to run rough because the pump cant maintain the pressure.