I’m losing spark on my DUI distributor, I charged the Module to Hei flame throwe,I got spark then lost it again.I checked all the connections and they seamed to all good.I just don’t know why I’m losing spark I have a spark plug tester.

Is this the GM coil on cap type? If so change the rotor.

They are very similar to hei distributor,coil in the cap.

Describe the lose spark in more detail please

I had spark on the tester, I took it off and went to start it and didn’t start I put the tester back on and no spark.

When I lose something I always start looking at the last place I remember having it but usually I have to get my wife to find it.

I don’t have one to tell me where I lost it.

I think I found my problem, took the coil off starboard motor ( this motor starts right up) put the starboard coil on port motor, motor starts up. I was looking at the coil and noticed the little ground wire in the coil had the black shrink wrap covering almost the bottom where it grounds in the cap.I cut the shrink wrap off the bottom of the ground wire put coil in the starboard motor, motor started right up.