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Idle Mixture

NOTE: If adjustments to the air/fuel mixture are made that require removing the idle limiter caps, BLUE Service Limiter Caps must be installed. Idle mixture should be adjusted only during carburetor repair or when necessary as a result of government inspection laws.
NOTE: Some 1977 Bronco and pickup models may have rough idling or exhaust fume leaks from the EGR valve. On Bronco models with 302", ensure EGR valve D7TZ-9D448-G is used. On F100 models, ensure EGR valves (D7TZ-9E448-J for 302" or D7TE-9D448-K for 351M") are used. On pickups with 460" pickups, ensure carburetor spacer, gasket, EGR gasket, spacer gasket and studs (D7VZ-9C477-A, 387544-S, D6VZ-9E464-B, D6VZ-9447BZ) are used.
NOTE: Some 1977 "F" models with 351M" and 400" engine may develop a rough idle. This condition may be caused by a loose vacuum fitting at rear of intake manifold. To correct this, remove fitting and apply Loctite to threads.
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