The fluctuating idle is usually a symptom of a too rich mixture. Before you fiddle too much with the mixture I would rule out air leaks. Is anything changed from before when it was running well? You do not list your location so you may or may not be violating some draconian laws if you adjust the mixture screw without proper dispensation. Calling911 has a simple procedure on this forum for adjusting CIS without gauges that worked well for me.
http://forums.pelicanparts.com/porsche-911-technical-forum/387704-how-setup-cis-no-gauges.html
My personal advice is to run a can of injector cleaner through the fuel system before changing anything. Costco has a good deal on Techron by the sixpack. They also have beer by the case.
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76 911S, 2.7, Bursch Thermal Reactor Replacements, Smog Pump Removed, Magnecors, Silicone Valve Cover Gaskets, 11 Blade Fan, Carrera Oil Cooler, Turbo Tie Rods.
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