yeah there really isn't any noticeable difference when the light is flashing. I've hooked it up to a snap on scanner and all of the cylinders miss fire randomly even at idle but the light doesn't flash.
I have an 04 yukon denali with gutted cats, cat back exhaust and an cold air intake. I replaced my plugs and wires maybe 1k mikes ago but still have a random misfire only other code I have is for an 02 sensor. the truck mainly misfire on the freeway over like 70 mph but it is getting worse. any...
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