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I have to say that when I took my 964 to Marco at TLG last year due to poor idling and popping of the air box, they weren't able to diagnose what was wrong with it. They are nice and courteous but their only recommendation was that the car needed to be driven. The wealth of information housed on this forum and Rennlist helped me diagnose the real root cause of the issue.
It turns out that The fuel pressure regulator had gone bad and needed replacement. I ended up taking time off work to replace the FPR, along with spark plug wires, and the car runs like a champ. The symptoms you describe sound like a battery voltage issue. They may be able to diagnose and fix it for you but they don't get my vote. Good luck finding a good mechanic!
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