Phil, I scratched my head on this one for sure . The plugs , wire, rotor and distributor all have about 13k miles on them. Most if not all vacuum hoses were checked a couple months ago and prior to that the coil and ignition assembly. as well . I had a new spare relay and its installation did not help. The throttle body did not need much cleaning at all as I had done so previously. However I accomplished the proper way of adjusting the throttle position so that was a good thing.

The weak components at present are the Crank position sensor ( wrapped up with aluminum foil ) and fuel pump for the failing check valve.I l stared into the engine and asked what the heck went bad so suddenly and then it occurred to me that the only component that i changed was the fuel press regulator and since I had the old one I decided to swap it out. Good thing I did. So I just ordered a fuel pump, CPS and a Fuel pressure regulator. They should arrive next week but I will be away for a few days before I can install them. I'll report back for sure and thanks again for the follow up.
paul