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Bad gas

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My car was in storage all winter,I notice it's ideling rough.Can I add a can of octane boster to it to freshen up the gas.Last year I put a can of stabil in it,but didn't do it this year.It has a half a tank of 93 octane in it,it's not licensed yet so I can't go fill it with fresh gasunless Ifilled a 5 gallon jug.Just wondering if octane boster would clear it up.
I think injector cleaner from Lucas would also help, besides the fresh gas. What you might look for is an alcohol free fuel for when you put the car in storage. It ages much better that E10.

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