For this job, you’ll need a fuel injector cleaning kit, fuel injector cleaner ... and do indeed get gummed up in the course of a car’s normal life. Once the injector cleaner is in the fuel ...

Over time and miles, your car might start to slow down. 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 ...

Fuel injectors can get gummed up with dirt and fuel residue over time. Photo credit: David Traver Adolphus / Autoguide.com.