Could be spark plugs, coil packs, injectors, carbon buildup on intake valves.
You need to plug into VCDS to get any fault codes etc..
I had misfires, which were the intake valves clogged up with gunk being direct injection.......common problem now with these engines and ages. Took it all apart and cleaned the intake valves out, cleaned injector tips with new seal kit and more healthy than ever now.