I have a 00 Blazer that just stared missing all the sudden. I changed the plugs,no help. Then I checked the fuel pressure which was 60psi at crank then droped to 55 psi ater it did crank,which took longer than most. When it is running it sounds like it has a dead cylinder. I also checked fire to the plugs an they all are firing. The only thing I have not changed is the fuel filter because it had correct pressure.