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1999 Silverado 4.3 missing

Discussion in 'GM Powertrain' started by craig82, Feb 28, 2010.

  1. craig82

    craig82 New Member

    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. craig82

    craig82 New Member

    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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