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This software upgrade a dealer thing or?

Have you tried replacing the gas cap with a brand new gm one? This seems to solve alot of pesky issues esp involving evap codes.

Hello, I have a 2007 tahoe with the flex fuel 5.3. I installed a comp cams camshaft 54-451-11 with pushrods springs and a double roller timing chain recommended by the person I was speaking with at comp cams. I had it tuned by blackbear performance. My issue is during WOT mostly 2-3rd gear...