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Yes, I'm new to this forum. My daughter in law has a 2000 Tahoe that only blows very hot air out the vents. It seems this is a common issue, and I see other people looking for help, but no one is helping. I guess if it's been talked to death, and you are new to the site no one wants to talk...

I just joined the forum today. So, I'm sure this has been discussed but can someone please give me some help?? My 2000 Tahoe with 5.3 engine is running rough at idle, sometimes dies. The code scanned was P0420 and the print out gave me several possibilities. The codes were reset two weeks ago...