Wow, so its is possible. Add me too that list of tons of miles on injectors.
Mine runs poorly to say the least too. Its odd because it was running fine until a month ago. But, before that it did start to idle a bit funky but i though nothing of it. Then on a moving trip it just sounded weird, then it got to where it is. Parked for a few weeks, while i get parts and work on it.
Other than that i got 21mpg on highway, and it never smoked unless you stomped on it. I didn't drive it much this summer ( only filled it up 3 times ) so i probably just extended the inevitable, and if there was a drop in mpg i didn't notice.
But, the truck will have a new ip, injectors, return lines, fuel pump, filter. Should go another 100,000 at least. I figure at that point i will stop using it as a daily driver.
Oh well truck only cost me $400 1 1/2 years ago. I think i have $1500 into it including the cost of the truck now. Can't beat that price. Other than this fuel system issue, i've just done brakes, u joints, voltage regulator, alternator belt, master cylinder.
Also got a ferret adapter on order. I guess i should buy a few more idi's to offset my cost haha.