CK5
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How soon after startup should the carb go from fast idle to idle? 78 4Bl qjet

i would try it on the engine. If you decide to remove carb, when reinstalling don't over tighten the front 2 bolts. if you bend the bowl it's done.
 
If you remove the carb be Careful with the metal Vac line on the back for the booster. If it’s been there a while they like to twist the pipe.
Use a backup wrench on the carb fitting when you loosen the line.
 
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