I can't think of anything that I did to it before this started happening. I do have a B&M shift improver that is hooked to the computer harness but it's been there for almost 3 years now. I haven't had any problems that I can think of, the latest work I had done to it was a water pump last year in October I think it was. Here's some background that may help. One Saturday my girlfriend and I were driving around for a few hours,(we did drive on a rock orad for a bit, could have knocked something loose) when we returned home, the truck sat for about 2 hours and when we went to start it up again, it wouldn't... Turns over fine, all that good stuff but found that it wasn't spitting fuel. So we checked the fuel filter, which had horrible flow and replaced it, still nothing. The fuel pump was kicking on and we had checked the fuel pressure and I was getting plenty. Sunday afternoon, I ended up replacing the fuel pressure regulator. After that was done, it fired right up and ran great. Sunday evening I drove it around for a bit and it ran perfect, it ran better than when I bought it... Got it home, parked it, hosed it off a bit and tried to start it and it wouldn't start... I tested the injecters for signal and they wern't getting any. The next morning I went out and if started right up. Narrowed it down to only happening when it got hot. After several frequent visits to mys10.com which I'm a member, we came up with the idea that maybe my computer was going bad. So that weekend I went to a somewhat local junkyard and pulled a computer out of a '93 Blazer with the same engine as mine. As you know, it worked untill this past Friday and it just wouldn't start. I have a new computer sitting on the kitchen table but I don't want to throw away that one to... I figure there has to be something causing the computer to go bad unless I just got real unlucky both times... Could the chip have an issue that would cause this problem? I've got a new one on the wasy, won't be here till Thursday or so but I wanted to figure this out before I put the new parts in... THnaks for your responce!