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Discussion Starter #1
Just purchased (rather stole) a 93 Blaz with the "W" engine. thought it only needed a good tune up, ie plugs, wires, cap, rotor, etc. It still runs rough and had it checked and NO codes popped up. Was wondering if it could be the fuel rail system or valves. Anyone have anything like this. EGR seems to be OK and looks to have been replaced even though looks are mpt everything. Thanks for any help
 

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It could still be the EGR. I would remove the EGR and check it for carbon deposits, if it does have carbon deposits, just clean them out.
 

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Discussion Starter #4
Thanks for the info. I have double checked the EGR, wires, ran a compression check and all seems good. I understand on the early "W" engines that the fuel rail is down under and that it caused problems.
 
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