fuel or electrical?

hello i have a 1998 dodge stratus es v6 and am having starting problems when
i let it sit for a few days at a time.
once it does start it will run good for a mile or 2 then start to miss and
almost die until it seems like it dries out. i do notice this is more of a
problem when it's damp or has rained outside, car sits outside because bike
is inside :-)
could this be a bad plug wire or cap or rotor ? what about the fuel pump,
don't they usually work or not? i sprayed the cap and the 3 plug wires i can
get at,the other three are buried, with silicon spray but this did nothing.
i took it to garage abd they changed the fuel filter for me and poured water
on wires i guess and couldn't get it to act up because it was initially dry.
there are no codes showing up either. thanks for any input or advice. Randy