The truck bashing here always makes me laugh. I actually own a deleted diesel crew cab Super Duty... that went over 2,000 miles towing last year hauling a 25' camper, three kids, two dogs, and the wife.
The only real benefit I have over those coal rolling bro-dozer douche bags, is I'm stock...
Not today, but yesterday had to put in new spark plugs after about 6k miles. Cylinder three must have had a hairline crack in the porcelain and it separated and blocked the electrode. The plus side is I got my 15 year old daughter to help, so now she knows how to work on her own car!
I'll get to the torque arm eventually, but I'm still on K03 and only stage 1. I strongly recommend the insert at least, my shifts are so much smoother now...
Most likely your oxygen sensor has failed. Two codes for the same sensor is pretty telling, and heating malfunctions are most commonly the sensor itself. Should be a pretty easy swap, you'll need a 22mm (or 7/8") wrench or O2 sensor socket if you have one.
I put in a dogbone mount insert last night, what a difference! Instantly smoother shifting and driving, and super minimal NVH. I went for the CTS Turbo insert, which is still pretty soft. I wish I had done it years ago.
Your throw out bearing is failing. It is a very common issue on factory throw out bearings. I recommend doing at least the clutch while you're in there, maybe also the rear main seal.
That sounds to me more like an issue with the Fuel Pump Control Module. Do you have access to fuel pressure testing equipment? Doing a fuel pressure test should be able to help you narrow it down to one or the other. But, if you're not able to test it, I would start with the module since the...
My last round of interviews I had two candidates come in with dirty t-shirts and jeans. Who TF can't even put on a clean t-shirt for a damn job interview?