how long can gas sit in a gas tank before it oes bad?

my can hasnt been driven in almost a year, i have started it up and ran it for a few minutes a couple of times. i hear that old gas is bad for your engine
Depending on ambient temperature and such, the gas may indeed be the problem.
If your climate is fairly humid and the tank was partially full, moisture may have formed on the walls of your tank and dripped into your gas. If so, you may




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