So I’ve looked all over the net and am having trouble finding my exact issue. I’m sure it’s there but it’s frustrating wading through 100’s of posts on many forums for specific situation. My research over the last few weeks has pointed me to this forum as the go to place for IDIs. So here I am and any help would be appreciated Now on to my specific issue. My old 300 finally died after roughly 400k miles and I hadn’t had a diesel since I was 19 years old (late 30s now). So I decided to get an idi because I think they are fun (loved my 6.9) I got on here and read a bunch of the newbie stuff and searched Craigslist and Facebook (shudder) for a truck. After a 3 week search I decided on a 1990 F250 extended cab 4x4. Unfortunately it’s automatic but it was the best truck in the price range I set for myself. We drove 135 miles to pick it up. Made it about 110 miles on the return trip. We took back roads the whole way and the truck ran great averaging 60mph. 40 miles from the house we had to get on the interstate or go through a major town at rush hour. Picked the interstate. Had to run 75 to keep from getting run over. Truck ran good for the first 15 miles or so of this. Then it sort of lost power and would pick back up again. Did that for 3 or 4 mins and we came upon a rest stop. I decided to pull in there and check things out. As I pulled up the ramp the truck died and I coasted to a parking spot. Would not start back. I had ran both tanks down to about 1/4 and was running on the rear tank. Eventually we left it there went and got 5 gallons of fuel. Batts were run down and we had to jump it but it finally started back. So after that incredibly long ramble my question is this. Do y’all think I probably just have a problem with the tanks ( I read that this is common) or was this related to the interstate drive. Has after market temp gauge that stayed right at 180 till interstate where it picked up to 205 and stayed there till it shut down. After we got it started back it made the rest of the trip like a champ, I stopped and filled the front tank up. The people I bought it from will take it back and refund my money if there is a major problem. But I like the old truck and would like to keep it if this is minor. They claim 125k original miles and the title does confirm that but of course I have no real way to know that for sure. Again I apologize for writing a book but I figured more details/information is better.