P0304 miss in number 4 cylinder

Sorry I forgot to add that in the first sending. I have between 195-210 in all cylinders. I also changed the MAP. With no change to the way it ran. I have pulled the valve cover and the cams both look like they are in great shape.

Here a condition I did notice. When disconnecting the plug wires from the plugs. There was an arch between number 1 and 4 terminals on the coil when I removed either 1 or 4 plug wire, 2 and 3 did not arch (with 2 different coils). Would be the PCM grounding the coil? You refer to PCM, is that the same as the ECM? It is fixed now.Thanks for your help. Had to replace the ECM.