What can make a popping sound besides your tire blowing out? on 2007 GMC Yukon Denali

Checked to see if it was my tire but it wasn't.

Asked by for the 2007 GMC Yukon Denali
Gun fire!! Any holes in your GMC? Had to fo it. Is it tunning ok? Possible engine backfire.
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My Toyota Tundra has a faulty tire pressure transmitter on one front wheel. I can put the recommended air pressure in and in a few days or less the valve will pop and let air out to 22lbs. I have done this several times, the dealer does not believe me. If have the window open it sounds like gunfire.
Well i be dipped, never heard of that!