My 2.0 Liter engine has running issues, my 75 D jet engine will sometimes buck or stop on the road. Options

[dralf]

My 75 Porsche with the original D Jet has started to occasionally buck or stop when on the road. Over the years I have replaced the wiring harness, the Maps sensor, voltage regulator, coil, trigger points.. and a few other items. I checked the dwell a month ago and it indicated the points were off, so I changed them. This seemed to solve the problem for a few short trips, however, the issue is now back with a vengeance. I limped home today with numerous events on the interstate when the engine just started to loose power and the reves would drop and if I did not down shift and get the reves to 4000+ or pump the gas the engine would die completely. Thankfully once dead it would start and if I kept the reves high I could drive a bit further. Once home I checked the dwell and it is at 50 which I recall is at the upper range but should not be the culprit. I do not feel vacuum leaks nor any obvious loose connection. Only thing I wonder about is that I noticed that the voltage going from the coil to the points is 6 volts, is this correct ?

Any suggestions as to where to troubleshoot would be appreciated. I will be checking out my fuel filter since I think issues with it could cause the engine to die yet restart easily.