I would first check the u-joints in the driveshaft. But it sounds like the transmission rear mount is broken. CHECK TRANSMISSION MOUNT.
Look underneath the passenger seat, it should be in a bag mounted to the floorboard.
UNDERNEATH THE ENGINE ON THE PASSENGER SIDE NEXT TO THE OILPAN.
check your vents on back of cab
yes
sounds like a knock sensor is service light on
Tim Allen does the Chevy Silverado HD commercial, but Dylan Bruno does other Chevy commercials (Cruze, Silverado).
YES they are the same.
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