I just got rid of some old fuel in my s13 that I believe was causing a misfire. I am about to put some fresh shell v-power in - should I add anything with the new fuel to help clean the system a bit? Like some octane booster or seafoam or anything like that? I figure since the tank is totally empty, now would be the time for that. Any suggestions? And should I put anything in BEFORE the fuel, or mix it in?
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'92 vert, '10 accord coupe
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