If it bogs only when wet/damp then it's most likely electrical. The list is long: Wires, dist., cap, coil, grounds, battery cables, Ignition Control Module, computer, etc. If moisture gets between any of these and the connections you will lose conductivity and the engine will bog down. Check and clean all of your connections. When was the last time you changed the wires, cap, rotor, etc. Moisture may be affecting the Ignition Control Module, causing a problem with spark. You're going to have to start eliminating from the easiest and cheapest on up the chain.