[Michael C Henry]

I once had a piecs of choke linkage come off and hold carb open , just above idle. That was a 73 Cleveland. It was equiped with an electric solenoid that established idle then let carb go completely closed for shutoff. That had a high idle and back fired out the exhaust while engine was coasting to stop. Carb open , engine spining , carb open a little sucking in fresh gas and air ,no ingition spark so now heated gas fuel mixture in exhaust waiting fo anything in exhaust to light it off.