You can use an injector cleaner in the fuel like gumout sells a good product and It's available in most auto stores. It isn't a critical with the additive packages in the gas today but OK once in a while.Using a bit of dry gas from time to time would benefit you also. It keeps condensation from building up in the tank.
Gumout Concentrated Fuel Injector Cleaner
$4.99
Gumout Concentrated Fuel Injector Cleaner
$4.99
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