Car hesitating to start Sometimes

I Have a 1998 Z28 with about 40000 miles the car had been sitting in my garage for the past year. I took it out the other day and it ran fine, then I installed the hypertech tune on it and ever since I did that the car has been hesitating to start some0times but when it starts running it runs great. So I installed the factory tune back and the problem is still there, sometimes it starts right up and other times it takes a few minutes to start up. The only other thing I did to it was detail the motor. Any ony have a clue what my problem could be?

you have to be more specific, does it crank? can you hear the fuel pump prime when you turn the key?