timing issue, timing light stops flashing for a split second every few seconds Options

[DRPHIL914]

so its missing every few seconds or so.
like when the heart skips a beat. So how or why would this happen- is it the points module?(hot spark) , seems like the most likely thing. I am going to put the 123ignition distributor in tomorrow, and it will be interesting to see if it still happens.
that will eliminate the fi points plate and the hotspark module in the old distributor.

So has anyone else ever seen this when setting the timing on their car?? if so what did you conclude?

[DRPHIL914]

thanks for the tips. i can say that i feel a skip or miss when trying to hold it 3500 rpm for timing, so pretty sure there is a missing spark, just not sure if its a bad wire or if its in the distributor. i can say the cap a rotor were replaced the last time i tried to check this out, and its a new blue coil too. Bosh plugs are probably a year old and less than 1500 miles on them.

will post after changing out plug wires, and will go from there