P0301 misfire on cylinder one

The pieces on my car definitely look different, with the most notable difference being that there are drain holes on both sides of the divider. Only 2 on the passanger's/right side (US) of the divider and at least 6 on the drive's/left side of the car.
I would take it apart again to verify where the water would go if you were to add drain holes there.
Seems like an odd setup for stock. My car, a US 2009 would not be capable of having the water issue (unless the holes were blocked).

 

On my car those drain holes are on the bottom surface.

 

That may be an aftermarket cowl, that someone replaced - because they broke the old one when replacing the windscreen????
I too never had an issue with water pooling there, unless it was stopped up with leaves and debris. That would be a common sense issue while engineering the car. IMHO; dumping any liquids directly on top of the ignition coils would be a major faux-pas and can cause intermittent misfires when the current gets discharged into the spark plug well walls instead of the other end of the spark plug.

Just my 2-cents....

 

Yes, aftermarket cowl makes much more sense... would be interesting if more of those who drive on the wrong side can chime in and say what their parts look like (and if known to be OEM and what year).

 

LoL; "wrong side" LoL; as you stated, they are right drive in Japan..... so that problem shouldn't exist - unless they wanted to give the "middle-finger" to the imperialist UK. More than likely an aftermarket part that missed the weep holes when the OEM plastic was scanned. It takes real effort to perfectly duplicate a part.

 

Get out the power drill?