Most shops offer this service, but before having this done, you might want to try the following: the next two or three times you fill the tank, fill it with a name brand, premium gasoline. Better quality gasolines contain additives (e.g. detergents) that are designed to help keep injectors free from residue. After a few tanks, you may notice renewed power from this engine. However, if this doesn't work, you'll have to turn this vehicle over to a mechanic and have the injectors cleaned