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It sounds like this may be a particular quirk of your engine build. With RHD ITBs and using MAP, I was able to get a solid 900 rpm idle without much trouble. I have a hand throttle for start up and extra cold weather, but that’s only needed for the first five minutes or so.
It might be worth rigging up some simple plumbing to test this idea before purchasing the IACV and running all the wiring. Some simple plumbing fixtures and valves would likely suffice as a proof of concept.
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-Julian
1977 911 S: Backdate, EFI/ITB, AC project in the works:
http://forums.pelicanparts.com/porsche-911-technical-forum/1106768-when-well-enough-cant-left-alone-backdate-efi-itb-ac-more.html
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