Actually try this and see if it happens in reverse.Where the plug wires go into the coil.Unscrew them (just with you fingers) and put the front lead in the back position and vise versa and see if the front runs and the back doesn't.That will confirm if it is the coil.As both cylinders fire at the exact same time so it won't do any damage.Do that I'd be interested to see what the result is.
