89 corsica 4 cyl 2.0 coil problem icm??

when i first started my car it would seem to start on two cylinders for four or five seconds then hit on all four. this went on for about a week. i finally checked the wires at the coil and they were loose. now it starts like it should. I start the car i drive to the gas station and it wont start. i push it out of the way and it starts right up. i drive it home and it wont start. it just turns over like a coil wire had been pulled off...i let it set for a while and it starts right up. so i can drive it to work and drive it home. then yesterday i was driving home and it just started running like it was running on two cylinders. would this be one of the coils are shot or the icm or both???