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SteveW,
What size idle jets are on the carbs? Keep in mind they may not be as marked as a previous owner may have reamed them out. My 911 2.2 also has Zenith carbs. I had this problem when I first purchased my car and fixed it by going to 55 idle jets. Jets are not easy to find as Solex is no longer in business. I have been told VW used the same jet on some of the early cars. I used a wire spark plug guage to roughly determine jet size 22/1000 is 0.56mm 20/1000 is 0.51mm. My jets were as stamped and were 3 different sizes 47.5, 55, and 62.5 go figure.
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Craig Dinger
'02 Sampson Titanium, Campagnolo 20 speed roadbike, daily commuter, 3,700 miles and counting
'71 911 T Targa for fun
'89 BMW 325i sedan wife' ride
'83 BMW 533i White/Cardinal red leather, Wet weather commuter
'89 BMW 535i auto to 5 speed conversion in progress
'98 Ford F-150 weekend hauler
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