I have Mazda 2300 series SE, 2001 with 86,000 miles. Just recently I got an ignition problem. CHECK ENGINE light is on and the OBD test showed code for misfiring and the ignition coil problem. I replaced the ignition coil, HV cables and spark plugs. I noticed that spark plug # 1 and # 4 do not ignite. I checked the ignition coil and there was no spark on # 1 and # 4. The OBD tester was still showing an ignition problem. I went to another shop and their OBD tester (more advanced) showed also a faulty camshaft position sensor. I replaced it and the problem is still the same. Only cylinders #2 and #3 are firing. I checked with an oscilloscope signals from PCM (pins 26 and 52) to the ignition coil. I have pulses, the problem is that I don't know if they are correct. I suspect that there is another sensor that is faulty but I is don't know which one and how to check it. The entire engine is made by Ford. Advice me please. Thank you.