[scooter5991]

I have a 1997 Blazer with a 4.3 L and 180,000 miles. The truck will start fine and for the most of the time will idle smoothly. Under acceleration you can feel a misfire occasionally. The big misfire comes when I am driving at 60mph or above. Thats when the check engine lit will come on and sometime it starts flashing. The truck has been sitting while I have been working on this problem. So in the last 5000 miles the fuel pump has been changed.(1 1/2 yrs ago) Since this issue has come up I have changed the plugs, wires , cap , rotor,(1 yr) egr valve. There was a egr code that was coming up so I replace the valve.(6 months) Now the code is just for the random misfire. I have some time this christmas weekend so I thought I might take another stab at it but I have tried what I know and now I have no direction. If somebody has a direction it would be appreciated. Also I will double check the egr code to make sure it is gone, but I need to get my scanner back over chrismas. Thanks again Scooter