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Hi All, New to the whole forum thing. Stumbled upon this while searching for help/info for some issues going on with my Tahoe. Looks like this is the place for my answers. I love my hoe and am excited to make it what I want it to be with the help from ya'll. Small background about me: When I...

I bought a 2000 Tahoe w/ 5.3 ran it for about a month, did a tune up, plugs, wires, oil ect. I also put on a cold air kit, and flowmaster exhaust. I'm now pulling a p0420 code. I am new to the mechanic side and learning as I go. I know what the code is, so I did a diagnostic pull and am...