Silver (what is your real name, we are a close group here),
Welcome to the forum!
Look in the upper right side of the screen and you will find the search button. Hit it and in the upper left hand window on the new screen you will be able to type in "idle" and something like "DME" or "3.2". Make sure that in the lower window on the left side you specify "911 tech forum" otherwise it will give you hits for all the cars.
Now, about your idle. Rough could be several things. Is it stable, hunting up and down or so on. Does the car die from time to time or? Also, update your profile with where you live. Many times its something that occurs in your area, like Oregon and the rain can give fits to DME cars due to the water in the distributor and so on...
My car is like yours, another 85 and has had various idle problems. One is the idle stabilizator valve, other items that can cause problems are the oxygen sensor and the cylinder head temp sensor.
Some things to be aware of here are that your car is a Carrera and the fuel injection is different from the earlier or later cars. Systems like yours are in cars from 84 until 89 and are referred as "DME" cars as they have the digital motronic electronic fuel injection systems...
I just did a search for you and came up with over 40 replies. The below url is typical of what you will find.
3.2 idle question
Hope this helps and post more info so that we can help figure out the problem.
Joe