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left side engine miss

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I have done all I can now I'm going to turn to you guys. have a 350 Vortec in a 96 GMC. I bought this truck about 6 months ago with no problems the engine is a JEGS motor with roughly 17k on it. I got some non ethanol fuel from an 'unknown' gas station and started to have an awful miss at idle. ran injector cleaner through it for about a week nothing helped still soaked plugs 2, 4 , 6, 8, were my problem children. Broke down pulled injectors out and replaced them put cab rotor and plugs in while I was there. Guess what same problem! But this has brought my problem down to only cylinder number 4. Did a compression check every cylinder passed moved on to an intake gasket sprayed brake clean around everywhere there could be a leak and nothing. Now we are to the point that it only does this when I start it hot or cold 90% of the time If I drive it just about any distance this will mostly go away with me only noticing it because I am now looking for it. Plenty of spark and fuel that is all going out of the tail pipe. Also now my only code is an o2 sensor which just started I would assume from all of my hard earn money going out the tail pipe.


Any help or ideas is much appreciated!

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