I have a 87' Chevy K5 Blazer w/ 350 TBI. While driving it I have had the check engine light come on, followed by engine miss firing. This occurs out of the blue and usually lasts 30 seconds to a minute each time. The rest of the time it runs just fine. It seems to be pointing to a elctronic module failure of sorts. Anyone have any experience with this kind of problem before? Any help would be greatly appreciated.