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I took my tahoe to walmart to get a oil change and they put 5w30 synthetic oil in. After I got home I was hearing a loud chirping sound from the motor. I replaced both belts and still had the sound. I took both belts off and still hear the sound. It's really loud at idle and I can hear it when...

I have a 2006 with the 5.3. The check engine light came on and went to auto zone and they pulled up a cylinder 1misfire code. I replaced the plugs gap at .040, replaced plug wires, cylinder 1 coil pack, cleaned throttle body and ran locus injector cleaner through it. I still have the misfire...