Hey there mr. Kilmer 

i have a 2012 gti with some rpm problems . When shifting into neutral the cars rpms stay stuck at 1100 the drop slowly to normal idle after 5-15 seconds or longer sometimes. I have smoke tested the car and nothing has proven a visible vacuum leak. I did notice that when i turn the ac on the cars rpms are working perfectly fine, its only when the ac is off im seeing this issue. I was wondering if u had any insight of where to look or what can cause this, i had the rear main seal fixed as of 2k miles ago back in november of 2022. Im running out of ideas, so far i have changed the pcv, spark plugs, purge valve, cleaned the throttle body, the water temp sensors and have even added a catch can. I do t know what else to check or do. 

2012 volkswagen gti 167k miles m/t