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Hi
I actually managed to follow the advice in some of these posts. That along with "101 Projects for Your 911" arriving, kind of helped me adjust my idle. I really appreciate all the help, but of course actually working on the car just leads to more questions.
I turned to mixture screw counter-clockwise (which I read would lean the mixture) and the idle got worse to the point that the engine almost died. I turned it clockwise (richen?) and the idle seemed to improve quite a bit. It improved to the point that the idle settled at about 950 and the backfiring, popping, and snorting (especially on a downshift) stopped altogether. BUT, when I unplugged the frequency valve relay, nothing changed. The idle didn't roughen, and the car ran fine with it unplugged. Not sure exactly what that means. Might it mean that I need a new FVR and then will have to re-adjust the mixture again?
I highly recommend the project book by Wayne. I have learned some things and found some things I would like to do, and I just got the book this afternoon!
Thanks again.
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