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try seafoam instead...have never seen a better fuel system cleaner..and i have used them all over the years(including gm's ). you can read more about seafoam here...it flat out works....http://www.seafoamsales.com/motor-treatment.htmlAs aksnowrider said cap and rotor, if you still have issues get the fuel injection cleaner from your local gm dealer, on that engine they use a poppet style injector (under the intake plenum there are injectors with plastic tubes going to the individual cylinders, at the end of the tubes are poppets) the only way to clean them is with the gm cleaner. You just pour it in the fuel tank and put some miles on it. Ive tried cleaning them with a BG injector cleaning tool and cleaner and it just doesnt get the job done. I can get you a part # for the cleaner if you need it.
like everyone has said do tune up plugs cap and the gear inside as i believe they dont have the rotor anymore. 02 sensors and clean your mass air flow sensor. does it miss all the time or just at idle if you bring it up to 3000 does it still miss? same when cold or warm?
i do know these things were famous for intake gaskets and i do believe that was causing some peoples mis fires.
As aksnowrider said cap and rotor, if you still have issues get the fuel injection cleaner from your local gm dealer, on that engine they use a poppet style injector (under the intake plenum there are injectors with plastic tubes going to the individual cylinders, at the end of the tubes are poppets) the only way to clean them is with the gm cleaner. You just pour it in the fuel tank and put some miles on it. Ive tried cleaning them with a BG injector cleaning tool and cleaner and it just doesnt get the job done. I can get you a part # for the cleaner if you need it.