POOR PERFORMANCE DECELERATION IDLE STOP SCREW ADJUST

POOR ENGINE PERFORMANCE ON THE 5.0L 307 V-8 ENGINE EQUIPPED WITH A 200-4R TRANSMISSION AND 4BBL CARBURETOR CAN OCCUR ON DECELERATION, DUE TO BUILD UP OF HIGH MANIFOLD VACUUM. THE HIGH VACUUM SEATS THE IDLE LOAD COMPENSATOR PLUNGER WHICH ALLOWS THE THROTTLE LINKAGE TO REST ON THE IDLE STOP SCREW LOCATED ON THE THROTTLE BODY. IF THE IDLE STOP SCREW IS NOT ADJUSTED AS DESCRIBED IN SECTION 6C OF THE 1981 SERVICE MANUAL THE IDLE CAN DROP BELOW THE SPECIFIED RPM CAUSING POOR ENGINE PERFORMANCE.

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