I had similar problems, I bought my lemon I mean 99' 150 for $ 3400 and over the last year about 6500 in it that's including expy rear end, rebuilt trans, after those two major pita, might add inconvenience, it wouldn't run, crank until the battery was almost dead, I was infuriated to say the least. One time when it finally started I drove it an hour to the dealership and told them don't call me till you can hand me a failed part. Called me a couple days later when they could get started and said it was the crank shaft sensor.. been running great ever since about a week ago, out of the blue dead battery,I thought here we go again turned out cracked ground clamp on the battery, so not charging properly.
But I really like the POS, all that said, I'm gonna keep after it.
Problems aren't unique to old Fords.
Good luck,
Mickey