I have a 2004 Getz with only 62,000 Ks, which is a fantastic car in many ways.

During wet weather it's fine, but AFTER wet weather, the damp or condensation causes it to develop a miss which I am sure is electrical, but there appears to be nothing wrong with the leads, spark plug insulators and the way they seal on to the spark plug tubes. I can drive it all the way across town and is still like that but after being then parked for half an hour, it mostly disappears. It's not like one cylinder is not firing....more just a general (but pretty bad) miss at a certain rev range, which disappears when I put my foot right down.. My deduction is that there is a tiny crack in one of the spark coils (there are two) which takes some time to dry out...but I cannot see a crack.
Does anyone know if there are any common problems which may also cause this behaviour ? And would you agree that two new coils would fix it ?Maybe a module ?
I don't want to buy coils and then find myself back at square one.