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Old 08-03-2004, 03:00 PM
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That's the idle air adjustment screw, used on some Pontiac, Cadillac, Chrysler, and Linclon models. It is used to adjust idle speed. With the engine at normal operating temp, turn the idle air screw outward to increase engine speed. This will lean the engine out which must be compensated by re-adjusting the idle mixture screws.

(info from 1969 Motors manual)

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