Ok bear with me, I have a 92 Blazer with the "W" code engine which I think is CPI. It's idling so rough it sounds like it's going to stall out. I've changed plugs, wires, dist. cap and rotor, fuel filter, and ran a can of sea foam through it. I've also checked the fuel pressure. It's fine. My next guess would be the plenum gasket. I've heard of them going bad before. Does this make sense to anybody? Before I waste my time changing it this weekend I need some advice. I was told the EGR valve is underneath the plenum so I might as well clean it as well. Any suggestions or advice would be greatly appreciated.

 

its prolly the regulator or spiders in the plenum. the gasket its self ususally stays good. theres a how to on this in the how to section (also called do it urself section)

 

Thanks man i appreciate it. maybe one day I'll know what I'm doing on this truck.

 

ya no problem were all here to help. and theres a ton of info on here to help u out so u can do most of the work ur self instead of paying someone.