My car is misfiring and I've changed the plugs and coils what else can it be cau

Hi, sorry for the long delay. The FSI and TFSI engines have a couple quirks that can cause this, the most prevalent is dirty intake valves. If the intake manifold has never been removed and the valves and intake ports cleaned AND if you are over the 60,000 mile mark, it is likely the cause, especially if there are no other trouble codes. Scan, see what codes you get, and if you have anything besides P0300-P0304, let me know.