My car is running sporadically.

What is your question?

One day it will be running fine and the next it will be surging, have a rough idle, and will die. We have replaced the rotor, cap, module, spark plug wires, coil, spark plugs, fuel filter, fuel pump, and oxygen sensor. I cannot get the computer to read. Somebody has suggested that it may be the computer or the timing chain. -Any help will be greatly appreciated.