02-10-14, 09:55 PM
Did you use the plug caps on the replacement coil? A few replacement coils I have bought in the past had corrosion in the caps.
Swap the plugs caps on Cylinders 1 and 4 with the plug caps on cylinders 2 and 3 and see if the fault follows the caps.
Swap the plugs caps on Cylinders 1 and 4 with the plug caps on cylinders 2 and 3 and see if the fault follows the caps.