Ford F-150 1992 Lariat Fuel problems?..?

[Eric]

Hey guys i just recently bought my first car.. or truck rather heh.. but when i bought the truck the old owner told me that the truck had been sitting for 15 months straight and had old gas in it, and said it would drive for about 10 miles and i would have to let it sit for 30 minutes to let the old gas clear out, he also gave me a new fuel filter because he said he thought it was the fuel filter with bad gas in it which would cause the truck to stall out and not get any gas. Well to make a long story short, i drove the truck home it kept stalling out about every mile.. had to wait.. while i drove the truck it felt like the engine wasn't getting any gas at all, it would sputter, and i would press the peddle down, and it wouldnt even take off or anything.. the engine turns off and i had to pull off the road and wait a little bit, now when i was on my way home i happened to stop at a shell gas station with a local mechanic there, he put in the new fuel filter for me and it ran fine for about a half a mile and continued to do the samething, now my question is..is this a fuel injector problem? old gas need to get some seafoam? or vacuum line failure.. im not really great with cars im just now getting into it.. i appreciate any replies or any help very gratefully.