Thanks for the info on where to find the ground. The Blazer has been running perfectly since I changed out the relay. I've made several trips back and forth to Seattle and it has started perfectly every time.

Next time I'm under the back end I'm going to check out the ground, though, just to be sure.

 

I to have a 94 chevy s10 blazer that had the same problem , it sat for like six months before I finally figured it out . And alot of new parts but the cause of it was the wire connecter that hooks to the spider were just a little loose , I found this out after i bought a new spider injector and went to install it the connecter was on there but just not snapped on all the way . Runs like a champ now and I have a spare spider just in case . It was crazy how much I had to do just to find this out , hope it helps .