The gun was picking up intermittent pulses and as a result, I got intermittent lights with the gun. I still use the PTU loop as that has worked best for me and get a light from the timing gun every time. For grins, I will also remove the PTU and check continuity per the FSM.
To clarify in case it was misunderstood. The timing is dead on and not bouncing at idle. The timing flat out moved AFTER the drive and sometime in the last 8-9 months since my build was completed.