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Originally Posted by Thunderbolt
My truck does the same thing and I checked the distibutor and everything else and everything checked out. I narrowed it down to fuel injectors. I ran Chevron with techron ( same cleaner GM sells) a few times and it quit doing it. Now after thousands of miles it is doing it again so I think I am going to let the dealer clean the injectors for $100.00. They have a sytem that hooks up to the fuel rail and they warm the engine, screw a pressurized bottle on, disable the fuel pump and run the truck off the cleaner until the bottle is empty at which time the engine quits. They then enable the fuel pump and they're done. I have heard it works pretty well and used a form of it back in the 80's when I worked on cars. GM has a problem with it and I have heard in California that they actually have converted them to actual multi-port fuel injection to cure the problem and meet emissions. The trucks currently have sequential fuel injection which doesn't actually control each individual injector. I think it is a cross between TBI and true multi-port. Anyway Gm says the poppet valves in the injectors hang up and cause the mis-fires and fuel injection cleaner with techron is the most effective.
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I have one these California trucks (1998 Z71 K1500) and there is a extended warranty (10 years or 200,000) on the procedure you just described. If a second cleaning is necessary They change out the SFI for MFI (mutiport flex injection). The funny thing is..that Chevron fuel caused my poppet clogg, where in your case it's the cure.