Confused

Hi everyone. I bought a 95 aurora about 5 mths ago from a dealership, about a month ago it started having problems. First it was when I was stopped at a light or stop sign it felt like it was going to lunge forward, then you could feel it when you were driving no matter how fast or slow. I took it to a shop the guy said it was the o2 censors, he raplaced them, said they still weren't working and said it was my computer and it would cost about 900. I took it to the dealership he said it was my ignition coil, he replaced it. About a week and a half later my car won't start at all. Please help if possible. Thank you.

check to see if maybe the coil connections came loose. check to see if something else may have come loose from the mechanical work.