The biggest issue I have on a recent bought A3 1.8T is the engine idles poorly (sputters and hunts for idle, has not died on me though) when warm, idles perfectly and very smooth in high idle when cold. Seems to boost good, engine is very quiet, NO EML. I found the Y hose off the valve cover pretty much disintegrated (a 2" at least exposed hole) So I am hoping this fixes the idle problem.

Second problem is the temp gauge never moved off of 60 (well one time I started the car it showed just below 90 but dropped down right away) Im going to replace the temp sensor tomorrow, but Im afraid this one might be a stuck open thermostat.

Third problem which I am not sure of is that the rear washer does not work, you can hear it turning on when you move the stalk but no fluid comes out, front washers work perfect.

Fourth issue is the front speakers on the bose system are completely wasted, has anyone found a direct fit replacement?

Any help or suggestions on the above issues would be appreciated!