[header] How to restore lost power in an old car [title] Add a fuel cleaning additive to your fuel. [step] As cars get older, lots of dirty deposits build up along the fuel lines making it harder for fuel to get to the engine. Adding a fuel cleaning additive to your car (as stated in the instructions on the bottle) will help clean these deposits out. 
[title] Drive the car for a week in order to make sure the fuel additive has had time to clean all these deposits. [step] It will take a little bit of time for the fuel cleaning additive to mix with the fuel and to reach the engine.