So your Audi was running poorly, and someone suggested you change the fuel filter. You did, and it's running better, but things still aren't right. It sounds like something got through to your Audi fuel injectors. The Audi fuel injectors are extremely susceptible to damage from dirt and debris in the fuel system. You can try cleaning your Audi fuel injectors using one of the commercially-available systems, but if that doesn't work, new Audi fuel injectors may be the only solution to your problem. Replacement Audi fuel injectors, like our Audi A4 fuel injectors, are designed to fit and function exactly like your original Audi fuel injectors. That way, you're ensured that new Audi fuel injectors will restore your performance and economy back to showroom new condition. Make sure you only use OE-spec Audi fuel injectors like ours, and not some generic-fit Audi fuel injector from the local parts store. The right Audi fuel injectors are only available here and at the dealership--the right Audi fuel injectors at the right price are only available here. We guarantee the materials and workmanship in our Audi fuel injectors, and we're always here to help if you run into problems. So give us an opportunity to show you a better way to buy Audi fuel injectors, and all your other auto parts too.