General Category > Quadrajet Carb Talk and Tips

1972 chevy c30

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jbh7052:
Got the choke pull off installed. Drill tap and marine tex the threads fixed the hot start! However, during the process something changed! I now have a stumble at steady throttle. The only thing I changed while in the carb for the main well plug leak was to change the plastic retainer that hold the power piston in place. I had left the original in when I rebuilt it but since I was there I decided to go ahead and put the new one in. It was super hard to get in place. The power piston moves up and down freely by using my finger but would that cause the stumble of it was not moving easily? Again it didn't do this before I replaced the choke pull off and the small plastic retainer  on the power piston.

Cliff Ruggles:
Check the power piston hanger arms, make sure they are exactly level and even.  Most likely the hanger is bent down on one or both sides, see this all the time......Cliff

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