It might not accelerate as quickly as it once did; the engine may not run as smoothly as you remember, or the fuel economy may dip—but everything else may work fine. If that happens, it might be time ...

Fuel injector cleaners are probably the easiest engine ... just be sure to put lower amounts in the tank—as much as it says ...

Is fuel injector cleaner snake oil ... usage of the product per the instructions of the bottle — yielded no change in the output of well-used injectors on a pair of the magazine's test cars.