I had the CEL pop on yesterday after I had been driving for about 20 mins. I left the store into a 35mph road that turns to 55 as it leaves town. When I went to accel to up to 55, the CEL popped on. Checked the codes today with the shop tech II and got a P0181. We cleared the codes after reading. I also had the P0401 and the P0404, but those are most likely due to the lack of cat and the larger exhaust.

I live in a cold climate. I usually plug my truck in at night because with wind chill, its usually well below 0. I use Stanadyne in every tank and have thus far had no issues. Is this something I should be concerned about?

I think I figured it out. Reading more posts, I found that I fit the conditions that set it. I plugged the truck in Friday night when it was cold, left it sit all day Saturday plugged in, meanwhile the temps rose slightly and come Sunday morning, it was in the mid to upper 30's. Looks like I did it by not unplugging.