Amazon has the 3M 08963 Fuel System Tune-Up Kit for $25 - 15% off with Subscribe & Save (can cancel at any time) - $10 rebate [Exp 12/31] = $11 with free shipping. Includes Do-it-Yourself Intake System Cleaner, Throttle Plate and Carb Cleaner and Complete Fuel System Cleaner.
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Seems like the effects are debatable.
This is more useful for a vehicle that sits around a lot with old gas in it, so the gas forms varnish, which to a certain extent is managed by modern fuel but not if it sits TOO long.