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Thank you all for the ideas. I’m leaning toward the Auxiliary Air valve (early car ICV) being the problem. I currently don’t have 9v batteries to do the test Ok-944 mentioned, but Clark’s garage has instructions to clamp the vacuum hose leading to the intake manifold.. when I went to do this the hose was very stiff and I’m not sure how I would go about clamping it. Anyone done this type of test before, or have any ideas?
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