Re: 1996 suburban 350 vortec engine is missing.
Does the timing on the scan tool read within -2 to 2 degrees? May have to have a tech two to see it. I've had distributors, injectors, even had a bad ECM one time that was cutting out an injector circuit... Start by elimination, check spark on #4, then fuel injector pulse and see if anything is funny. These trucks are notorious for a bad injector poppet causing misfires and all sorts of issues.
Josh
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