my Dodge Intrepid was running a little off and I put in a can of Seafoam with a tank of gas and ran it down close to empty to clean up the injectors ..... the car is running very smooth now.... it does have 125K miles on it....

edit: and cleaning the throttle body is an easy job... take off the intake, pull the connector off the TB, pull 4 bolts and you have it in your hand....clean to your hearts content....