VW Golf 1.2 TSI is still misfiring

VW Golf 1.2 TSI

Hi. A couple of weeks ago, I was driving and my car lost power, the EPC, check engine and ESP light came on. I took it to a mechanic and he diagnosed it as a fuel injector problem. Since then he has changed the fuel injector, the spark plugs, the fuel injector seal but it is still misfiring. I don’t understand what it could be, Help!

Finding out what the check engine light codes are would be the first step. If you have or know what they are post them in the comments below for further assistance.