1988 Cadillac Cimarron Cadilac Wont start

Car had sat for about a year at father inlaws. Put a new battery in it, changed plugs and wires, put some new gas in it because it was on empty already. It started up but ran rough like it had a miss. Trouble shot that to coil pack (#3 & #6) not firing. Changed it out and she ran great for about 30 min. Parked the car and went back to try and start it and wont start. It will sputter and start for 2 seconds but never reach that leveled out idle. Fuel pressure is 35 -37 lbs running. When the eng is off and key on fuel pressure is 40 - 43 lbs and when I block off return it goes to almost 60 lbs, at the moment I don't remember if pressure switch is good. I bought a new pump but at this point I don't see it'll fix the problem. It started and ran great 2 times all day which leads me to believe its electrical or something is malfunctioning. I verified injectors are working, verified TPS is with in specs. I found EGR valve is not functioning properly but that will not prevent the car from starting. I verified the car is getting spark from all three coil packs, plugs are firing a red or white spark. I checked fuses under the dash all good. Checked for trouble codes and their were none. Checked for loose connections found none. Found a problem with cooling fan but I didn't chase it (fan switch or temp sensor). Performed a leak down test and all passed and did a compression test and it passed. Presently at a complete loos as to why it wont start and when it does their are no symptoms, runs like new.