Random Starting Problem

I have a 1988 Corvette which I was having an intermitten code but the light wouldnt stay on long enough to find out what the problem was with a scanner. But it did have a history of a bad maf. So since then Ive replace the Maf sensor and both maf relays. I havent driven the car much but I havent had the light come on since. My main problem with the car is at completely random times I'll have a start-up problem-sometimes it'll crank for a long time before it starts while at other times it'll start right up. Also A few days ago I noticed that that engine is missing. I just checked all the spark plugs and the plug wires and they check out ok. Help needed to get my baby back on the road asap and would be greatly appreciated!