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Chris: 'Hunting' at idle is a usually a symptom of a disconnected or broken hose between the AAR and the intake air distributor. If the hose is secure and sound then I would suspect the new AAR is at fault. I don't know if there is much else that can cause this problem. In my experience all FI distributors are interchangeable except maybe the dual vacuum systems that probably need to keep a dual vac distributor. These have two ports on the vacuum can so they are easy to spot. The different models have slightly different advance curves, some are suited best for AT and some for standard. It's nice to collect a few as you go and just find the one you like best. You won't get much of an idle from a poorly timed engine even if your diz is fine, try timing the car statically to get a starting point. Also make sure you're running clean fuel and your system has the recommended fuel pressure. Low fuel pressure makes for a pretty crummy idle. Andre ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org