2001 Intrepid ES 3.2 95,000 miles

Ok I got into a car accident lets put it that way. After I left the shop with my car and noticed the check engine light was on. Thought not much of it since they put in a new battery and radiator. Thought it would kink itself out after awhile. Later that night after going out for a couple hours the car began to stall. When I tried to start it, just tried to start but wouldnt stay running. I had to baby it at 1500 RPM the whole way home. If I pressed the gas hard or beyond 1500 RPM it immediately died. So I brought it back to the mechanic. He says its the fuel pump. Earlier my brother tested it and came up with the P0445 code and said something was up. Thats why I went back to him. The car sometimes wouldnt start or would randomly stall out but after trying many times it would eventually let me kinda go but really slow. As I said before I had to baby it. He fixed the so called problem and threw in a new fuel pump. Next thing I know im there to pick it up and its on a flatbed he tells me 6 codes came up and he doesnt know whats wrong hes bringing it to the dealership. He also told me it wouldnt run still. It would start and run alittle longer than it did before but would still die out. Please help me out.