1969 Ford Galaxie Distributor issue

Check resistance of wires first 5000 ohms per foot and make sure no carbon tracking /cracks in dist cap carbon tracking looks like a pencil between cylinders. Then check compression. It also could be a valve problem like a pushrod thrown or bent. Compression shold be with in 20% of all cylinders.

I've done this for 48 yrs so I've forgotten a lot. But dwell should be 30 degrees and i'm sending the correct way to wire the cap firing order ways. But if memory serves me right, these things had vacuum leaks that normally came from the carb and it took a carb overhaul to fix it. I'm assuming this has a 2 barrel carb on it which are pretty reliable. Also the breaker plate used wear the pin where it advanced, not the vacuum advance pin but another on the plate itself which would feel like a miss and the vacuum advance and pin linkage would wear as well. If this has an egr on it as I forget if they did or not, check the egr plate beneath carb as they would carbon an dclog up then burn through causing a vacuum leak/miss. Like said in prior reply check plug wires for resistance, kinda twist them around when doing this as that may be bad as well. Finally check your spark plug gap it should be at.035-40 for it to fire right. It could be a bad plug/s as well. I really can't think of much more to check.

Oh one other thing take some sandpaper and sand points in dist cap as well as running a wire brush inside cap at those points. Sometimes they were sprayed with lacquer and wouldn'send fire to wires/plugs. But make sure to check resistance in wires.