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.