First step, start downloading:
**** SRT-4 / Neon Service Manuals ****
you need to get savvy with the pin out on the PCM and start tracking down wires. You need to fix 3 things and then get a tune on the car and itll become driveable.
You need to fix the IAC low circuit; its the harness on the throttle body, white connector. Something is wrong, could just be stuck closed. This is why the car is stalling so badly. You can remove the IAC, believe just one torx screw, wiggle it out. Clean it with brake clean, spray a little silicone spray on o-ring and spring area. If you still have code, trace the wiring back to PCM. Could be cut or spliced somewhere.
Next are the two temperature inputs, need those to have the car run right timing and fuel wise. The main one is in the up pipe, near your blow off valve. I dont see one at all, should be installed in the pipe. Again, maybe just cutoff, just laying under the hood wouldnt let it throw a code. Check the pin out diagram for wire colors.
Ambient or Inlet temp sensor is normally in the air intake pre-turbo, clearly you dont even have an intake, so its not installed, but most people just let the sensor sit in the fenderwell if they run a filter right on the turbo. Its wired near the front of the battery, again with the code prob means wires were just snipped off.
A new IAC, new temp sensors are all gonna cost under $50 to buy new from RockAuto, if you need to, then its just running wires from each to the PCM. Maybe just go ahead and do that. 16ga wire, 6 wires, run some wire loom, use the pin out diagram and get them newly run.
Last will be a tune, best if you take some closeups of the injectors, at least so the tuner has a starting point. Either way they can dial them in pretty easy from scratch, theres only so many choices and options.