Engine miss after replacing timing belt

Today the MIL appeared on dash. Code was P0202 - Open or shorted condition detected in control circuit for injector No. 2. I checked injectors with Ohm meter and all read 12ohms. Upon acceleration the miss dissappears. At idle I pulled the #2 spark plug boot from plug and fire was present, and no change in idle speed. I fastened #2 back and pull #1 with same result. Definite change in idle when #3 & #4 were pulled. Next, I put a long screwdriver to my ear to listen for injector pulses for each cylinder. All 4 injectors seemed to be clicking.

None of this makes sense. The owner said car ran fine until it just died traveling 70 mph. I am almost certain that these engines are "safe" in case of timing belt failures. I've replaced atleast 4 timing belts on same make and model Neon, as well as many other makes in the past and never experienced anything like this. Injector wiring harness appears fine, and were never disturbed upon repair.

Thanks so much for your advice and suggestions.

Prior to the MIL. I unplugged #2 injector while engine was running. That had no affect: just as removing spark plug boot. The battery was low and had to be boosted upon the initial start up. Removed battery and left unplugged for the night. I assumed this would erase and clear the MIL for #2 injector. This morning cranked up with new battery and MIL remained.

I feel as if Im just chasing my tail. In the morning I plan to swap #2 & #3 injectors to see if it sets a different code, and or runs differently. Next will be removing timing belt cover, mount and dampener pulley again to check the timing, again. Is it possible that if I was off by one notch the #1 & #2 cylinders are dead while idling, yet kick in at high rev? Because that's what's going on!

Thanks for your time