Please choose the correct ending to complete the given sentence: Cars & Other Vehicles: [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.

Ending1: [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. Ending2: [substeps] Inflate enough fuel to get your car running normally. Add more if there is little fuel in the tank. Ending3: [title] Get the engine running as soon as possible. [step] A pre-or post-fuel leak will take an hour to fix. Ending4: [substeps] Mix a fuel cement to be synced in your existing fuel pump by completing a major check that the fuel pump is working. Dust the syncing powder (usually midnight grind) off of the fuel tank.

Answer format: ending1/ending2/ending3/ending4