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Back in the days when doing a few street engines I would adapt the 'emission' type electric solenoid idle unit on to the holley equipped cars. This allowed me to set the 'running idle' speed slightly higher than would normally be acceptable to prevent stalling etc by means of the adjustment on the solenoid and adjust the original holley idle speed down to an absolute minimum to avoid any possibility of 'run on' after shutdown. In doing so the throttle plates will be below any discharge holes and fuel wont be drawn into the engine.It was also important to ensure that the secondaries were pushed completely shut at this position as well- this could also be the cause of your current problem.
Jac Mac
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