I have a problem with my truck running when outside temp is below 15 degrees. My truck started fine when temp was 8 degrees, but after a mile or so, the check engine light came on and my truck lost power and I couldn’t go faster than 18mph or so without it sputtering and dropping to 5mph or so. This happened once before when temp was cold like this and I had it towed to dealership. They first stated I needed to change Fuel pump (mileage 50K—cost would be 1800), but they left vehicle in their heated bay overnight and next by next morning the truck no longer had same fault and drove fine. They said fuel must have gelled up (even though I treat for that) but if it happens again, we would probably need to change out fuel pump. When they previously checked the fuel pump, I was told it wasn’t putting out the appropriate fuel per minute it should be (I think I was told 350 fpm when it should around 550 fpm). Needless to say, I thought I dodged a bullet until this morning when temp dropped to single digits again. If anyone experienced this same issue, I would seriously appreciate your assistance. Thank you!