1985 Other Oldsmobile Models won't start when wet or even mo

My oldsmobile is only a winter beater but is in immaculate condition. I have already replaced the cap, rotor, wires and plugs but still have same problem when it won't start it still has spark but is very weak. Bring into garage to dry out and it starts. Is there a module that is sealed that may be bad any advice would be helpfull thank you Jason Force