Code P1320, starts and stalls?

I have a Nissan Bluebird Sylphy 2002 G10 (QG18). It starts up fine but stalls after a minute, or whenever I changed the gear into D or R. It even stalls out after revving on the accelerator. I scanned the car, and it gave the code, P1320. I have replaced all the spark plugs and ignition coils. However, after checking the wiring with a test light with “Key On”, I have noticed that on cylinder 1 (out of 4 cylinders) the signal trigger from the ECM was not coming though. All cylinders have the 12v (…battery voltage) and was well grounded. All other cylinders have signs of receiving signals from the ECM except cylinder 1.