Usually it is a low idle problem.... when the dirt gets too much in the throttle bore.
The high idle could be due to the throttle being faulty or the vacuum leaks I mentioned earlier.
Cleaning and adapting, as well as smoke checking is what I would start with if you came to my shop.
There are smoke testing clips on my site... search for smoke in the search bar to get some sample clips.
November, 15, 2012 AT 1:48 AM
I forgot to mention "check valves or one way valves" that can also cause idle / performance issues. The 1.8T engine has a number of them.
The check valves allow and block air flow when the engine is under turbo boost or not under boost.
November, 15, 2012 AT 2:03 AM
Thank you for your help I really appreciate it. One other question, if I need a new throttle after being put in does it need to be programmed. I will give my mechanic the info and let him see the video, again thanks for the help. It is so useful.
November, 15, 2012 AT 2:35 AM
Sorry about the late reply. I was driving home.
I always perform the adaptation on new throttle bodies. As long as it is the correct one for the engine, it should be ok.
Don't buy any parts until they are confirmed to be bad!
I can only guess over the internet. If your mechanic is not familiar with VWs, check with a VW Specialty shop in your area.
November, 15, 2012 AT 2:43 AM
Thank you very much enjoy the rest of your evening