Ossy1020

I got my car for $1000 ran fine for the first couple moths then it started having problems I got a couple engine codes and it was always a cam code and along with it random misfire codes. I replaced both sensors and it seems that the code never went away so then my fuel pump went out so I didnt drive it for a while until I replaced it and then when I did replace it I checked the multiple misfire code and it seems that all of my left side cylinders aren't firing. I've swapped the ECMs to see if the problem would jump banks but it didn't. Now the car won't drive at all it will just stall in idling and then die. Could it be that I have a timing problem or wiring problem? All help is appreciated thanks!