Cranks over but does not start

Driving my car and it was performing like usuall then I turned a corner and for some reason it lossed it's power and the idle dropped. Seems like the engine is running really rough now. Usually it would shift at 7000 now it shifts at 4000 grand and there is no power. Anyways was driving it home and all of the sudden it started running normal again. Ended up driving to the store and on the way there it ran rough again but then in a block, it died and would not start. Got it towed home and found that the negative battery cable came loose off of the engine block. Well I tightened it so there was a good ground. It started fine. No problems but it runs really rough still. Well I let it sit in my driveway till I had time to work on it. Well when I finally went to work on it. Now it won't start at all. It will crank over but doens't fire. Could I possibly have a bad ignition coil or Module that went bad?