Ok. Well I can't find any hoses behind the engine as everyone suggested. I did find two ccv vent hoses on the front in good condition... Unfortunately I broke the connector on one and it should be here Monday to fix it. Pulled the coils and a plug and they are super clean. Plugs look like they are burning great. Not going to replace ...

The fact that turning the AC on fixes or significantly improve it make me and my Audi mechanic buddy think it's not a vacuum problem. Maybe a coil going bad... But no codes. I already replaced the MAF and that wasn't it so im really considering trading in as it needs tires, alignment and brakes shortly and the nav screen is going out. I can't handle fixing all that an still having this worsening idle problem.

Any other ideas ?