help, car won't start

okay, so I have just left the barracuda sitting for 2-4 weeks and I go to start it because I know your supposed to let them run like once a month and it won't start...last time I had it out it didnt want to start when I was out in it, guy put his screw driver in one plug wire and it would not spark and all at once just started while he was checking... today I didn't get a spark from there either but was using a rusty drill bit so not sure if it was conducting so I try the wire coming out of the coil and it sparked so would it possibly be the blue box on my inner fender gone bad? or would the coil not spark if it were bad? or would my distributor be going bad? kinda clueless and don't wanna leave it sitting all winter... any help is great.