1992 cutlass convertible engine dies

Hello again, I posted a while back with this issue. I took it to the dealer and they did an in depth diagnostic where they removed intake and fuel rail to check the injectors and also checked everything else. They called me after three days of having my car and said the problem went away and that I could come get it. I picked my car and it didnt act up for two months, until now. I drove it to work last night and it died as I was backing in to my parking space. When I first had this problem I did this I had replaced the ignition module , fuel filter, ecm, the sensor in the air filter box, crank position sensor and the sensor on the back side of the throttle body. I think I had checked the fuel pressure and it was ok.. I looked up some info and it said fuel pressure or pump, egr, map sensor or wires and plugs. I was having a rough idle on and off so I changed wires and plugs and found a couple of spots where it had shorted on the engine. Also it runs like a little dream it idles good, it does however stutter when I give it gas at high speeds or attempting to go up a steep hill. I read another post and I think his problem was a camshaft position sensor, could that be my problem? What is different than last time is when it died this time it was a little difficult to restart, I let it sit for approx 1 min and then it fired back up.
3.1L v6 145,000 miles.