1998 Plymouth Voyager Will turn over but won't crank

Engine Mechanical problem
1998 Plymouth Voyager 3.3 6 cyl Two Wheel Drive Automatic

After swapping out a bad engine and driving it for several months, it just stalled and won't start. It will turn over and it is getting fuel. I checked the coil and it is working. I have changed the crank shaft positioning sensor, went and bought another running voyager and swapped out parts from it and it still won't start. I replaced the fuel pump with a new one. I ran codes and I had a 122 and a 340 code. But still cannot locate the problem. I had to clean out the catalytic converter to start with. I have now ran a ground wire from the timing sensor and the crank shaft sensor and that didn't work. When I try to crank it, it turns overs then it sounds like it is spitting back fuel or air.