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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,677
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On rare occasions, I will disagree with Henry. Intake air leaks frequently cause starting and running problems, but the metering plate does not come out of adjustment in normal use. If no one has messed with the metering plate or CO adjustment screw since this problem began, do not try to adjust those yet. Most likely, something else caused the problem.
Follow up questions: As kmcteer asked, was any work done recently that may have caused the problem? Did it happen suddenly or gradually? Have you checked the timing yet? Does the distributor RPM and vacuum advance work?
Check all those, and if you still have a problem, try to adjust the idle speed.
Then check for intake air leaks with a "smoke test."
Tell us what you find.
For your reference: https://cis911primer.com/home.html
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
Last edited by PeteKz; 07-16-2025 at 12:09 PM..
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