Wow, I guessed this one right! I just caught this post and as I read your plight my initial thought was bad MAF/vacuum leak. I had the same thing happen on my V10 motorhome about 1500 miles from home.
Don't overthink coils on this motor, they really aren't that common of a problem statistically. Fuel pumps do go on these vans but not until higher mileage/years.
You've bought one of the most robust and reliable trucks ever, don't get a bad taste in your mouth just yet. Glad you got it sorted, and welcome!