If the cam sensor has a problem then the car would stall or even not start at all.
Does the engine react to pulling the plug on another cylinder? If yes, then the problem is with the first cylinder. No fuel or no spark.
If you connect a test spark plug to the lead, do you have spark?
Is the 12 volt feed present on the injector for this cylinder?
How much resistance (ohm) do your injectors have?