94 z28 starting problem

I have a wierd starting problem in my 94 z28. If you try to start the car cold it wont turn over as if the battery was dead but if you turn it on and off really fast repeatedly it will eventually start. But once it starts and warms up it will start right back up with no problems. Any ideas what could be causing this. Thanks.

So rolling the key fast gets it going? If so, I'd be looking at the ignition switch. :2cents: