Disconnect choke, manual throttle and gas pedal throttle linkages.
Does it still idle really fast?
If no, fix your linkage problem(s).
If yes, can you manually pull the carb's throttle lever back to idle?
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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