Engine would surge at idle and might die coming to a stop. Had fuel pump and injectors replaced without fixing the problem. Replacing the pressure regulator fixed it.

After consulting with 3 different mechanics who told me the car ran fine. They never lit it go to closed loop. I had to find the solution myself. I finally documented several internet articles that referenced fuel injectors. The mechanic ohmed them finding all were less than 16 and one that was almost a dead sort. We replaced them. The vette runs like new.