Thought I'd update my experience with the CEL and code 0301:
After living with it for 5 years or more, I finally got around to changing the fuel injector on cylinder 1, with a cheap aftermarket OEM clone I bought on eBay.
Keep in mind my symptoms were mild - a misfire at idle speeds, but nothing horrible. The biggest issue was the CEL always being on, and consequently not being able to use the cruise control.
However, it works great now! I have put over 6000 miles (10,000 km) on the car since the swap, and it runs and idles smoothly, always. I would say that fuel economy is better now, too - however, that could be simply a result of using cruise control now.
So in my case, the coil pack was NOT the issue; rather the injector itself.
Very easy to change yourself, so don't hesitate to try it.
I wish I had done it years ago, but clearly it wasn't a huge issue on my car.
Good luck!