Wanted to thank everyone for the responses and ideas I have been traveling for work and getting my daughter married off so the car took a backseat.
But I finally got caught up and back to work troubleshooting on the car.
Everything tested kept coming back as good, but I went head and I purchased new Relays and an O3 Sensor, because they were low-cost and have extras around for testing seemed a good Idea.
The issues was easy to repeat, O2 sensor plugged in the car would run fine for ~15 mins then go to crap. (I kept thinking it was a heat sync issue.)
After testing and replacing the Fuel pump relay, ECE Relay and Coil, I finally replaced the O2 sensor and success.
Drove 200 miles of back roads around Chapple Hill and Washington TX today with my daughter. Car ran flawlessly.
Moral of this story is, start looking at what you touched last… I must have messed up the O2 sensor/wire when replacing the exhaust.
