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Silverado missing

Discussion in 'GM Powertrain' started by craig82, Mar 15, 2010.

  1. craig82

    craig82 New Member

    My truck is missing at around 2krpm. The only code that comes up is P0420. Can a clogged cat cause a misfire, or is the other way around? I took it to the dealership and they said it is the cat. They want way to much money for the part + labor. They said they did a back pressure check and that leads to the cat being bad. Please help, I dont want to dump money in the wrong parts. 99 silverado with 4.3 and 101k

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