My 95 Blazer has been idling rough since I took it on a hunting trip in South Dakota (1500 miles in 5 days). I cleaned the EGR valve with sea foam and that did not help. The check engine light comes on every so often and I did get it to read a cylinder three miss fire. I replaced the wires and plugs. Check engine light went out but still runs rough. I decided to replace the fuel injector spider assembly since it was original equipment (142K). The engine is new last year and has about 20K. I was thinking of replacing the EGR but there is not engine light (yet) and they are expensive. I already have about $350 in it and am in need of some help. Any suggestions.
Regards, Mark