On this last issue. it'smost likely a wire or connector that isn't sealed well and the water get into it and causes the miss.

A small spray bottle of water and little time spraying the engine in small areas should closely pinpoint the cause.

ok I will try this and see if I need to change them. Any certain brand that I should use?

If you're referring to plug wires, then try to get Beldens from NAPA.

Or Autolite Professionals or AC Delco wires.
All have been found to be good lifetime wires.

Uhm, yeah...like he said...