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  1. #1

    Default 1999 Silverado 4.3 missing

    Today my SES light came on and is giving the cod P0420. I noticed the engine is missing when it gets to about 2000 rpm. I know the distributor cap has been replaced. Any ideas on what I should do next. I know the code means possible cat problem or an 02 sensor. Any help would be appreciated. Thanks and have a great day.

  2. #2


    Well, I just wiggled the plug wires and made sure they were plugged in. They all seemed to be. I took it for a drive and it did not miss this time. Vehicles can be real frustrating. Anyway if anyone has any ideas it would be greatly appreciated.

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