Need assistance with a strange engine miss

[tjtbelmont]

I just bought a 2007 RS4 a couple months ago. It is a super clean car and I love it but I am having a strange engine miss. Not the common random misfire that is from the coil packs. I did a carbon cleaning, replaced the injectors, changed plugs and coil packs. Runs great but when I stop at a light and the engine idles it sounds and feels like it drops a cylinder. No CEL, start driving and it is hard to clear up. If I shut it off and start it right back up the miss is instantly gone. I am waiting for my Vag- com to show up so I have not found which cylinder it is if it is even the same one all the time. If I bring the idle up a couple hundred RPM it usually doesn't happen. Reason I replaced the injectors was because it already had new coil packs so I figured with 120k it might have a dribbling injector causing it. I couldn't find anything on here that described a miss like this. Any one ever heard of anything like this?

[mnthny4]

Did you yourself replace the injector or did a dealer do it cause that engine is a FSI system and injectors have a special type of seal at tip that needs a Audi tool to fit those seals onto injectors ,so u may have a injector that is not sealing right ,also check the vacuum activated flap lever at front of intake manifold if they work like they should have someone rev car while u watch for lever movement ,one more thing to check is the cat for blockage feel exhaust on that side if it feel extremely hot like it will burn your hand sign of a cat going bad ,good luck