Petronix Spark Drop Outs, ....happens at less than 1000 RPM Options

[rbzymek]

This summer I installed a new Pertronix "Flame Thrower" dizzy with pertronix pick up and their recommended coil. Since I have sorted out the AFM I have attempted to dial the idle down to 950 RPM. At that speed I get intermittent spark drop outs evidenced by tach needle dropping along with engine stumbles and the occasional stall. When I throw on the timing light it is obvious that there are missing spark events. The dizzy shaft has side play. There is no way to reduce the gap which would probably help the situation. I have been in contact with Pertronix and they have sent some items to check which made no difference as they did not address the root cause which is probably shaft run out and uncontrolled gap. Has anyone had this a similar experience?