Mitsubishi 3000GT Engine Not Cranking Over

When U Turn Key On To Start There's Power But Won't Crank,and The Relay Are The Only One That Clicks. One Above The Fuse Box By The Brake...

I Have A 1992 3000gt And It Runs Great..it Loses Fire, Dies, And Wont Crank Up Until It Wants Too,usually A Few Minutes, Then It Will Fire...

My 91 3000gt Takes Time To Turn Over But When It Does It Will Crank. What Do You Think The Problem Is?