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Registered
Join Date: Jul 2001
Location: Wilmington, NC USA
Posts: 635
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You do not have mixture screws on the throttle bodies, those are air screws for each intake. They should be adjusted so that you get an idle of 950 RPM with even air flow through all stacks. The mixture is controlled from the MFI pump. Sometimes carbon builds up in the air passages and changing the air scews have no effect. If that happens, remove screw on offending cylinder(s) and spray Chemtool B-12 liberally into the passages. Be careful, this stuff eats paint. If you have set the idle with the screw on the microswitch you need to readjust per the manual. Download Check, Measure and Adjust from the tech articles site here at Pelican. It will tell you how to adjust the air flows and linkages if they need to be adjusted which I doubt unless someone was in there before you. Hope this heps.
Jim
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69 911 2.3Ez
85 928S
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