Today, I drove my 2001 blazer to the gas station. It ran fine. I filled it up and started it. The check engine soon light came right on. It ran rough all the way to work. It was in the mid 80s. I drove home from work at night with the temps in the high 60s. It ran a lot better. I know it it's still miss firing but not as bad. I don't know what is other than a fuel issue. I think it is ether pump filter or spider injection or all three. I know the spider injection is the one before the kind of fixed it.

 

It may not be as bad as you think. Run the codes and if you need help, post them. If you don't own a scanner, go to an auto parts store that scans for free. While you're there, grab a new fuel filter. That way you know it's good.

 

Sorry it took so long, I just changed the cap and rotor. I also I had to put on the adapter under the distributor to hold down the cap because the cast broke off where the screws go. It runs much better now.