How much is a new coil?
Read all of this especially the 2013 post.specific miss on 2 and 8 after tune up.Hope you find something before it is time to hit the road.
Since it was running fine for 200 miles something has changed for sure as we all know. You are leaning spark and not fuel to be the problem and I tend to do the same. However when going from good running to poor running you have to start all over again.
Fuel pump pressures and new compression test would rule out a lot of things. The capacitors mentioned in one post could be the issue if it is electrical in nature. At this point we have to assume the problem could be about anything. The more you rule out the better.
If you are getting spark, fuel at the right time and place and have fair compression you should run we all know.
Keep us posted.