I have a 1993 4.3L Vortec 4x4 4-door Blazer. It always starts right up when I get in it in the morning for work. The problem arises when I turn the truck off after it has had a chance to warm up and then try to restart it (like if I stop for coffee on the way to work). It usually requires 2-5 tries before it will actually start. The engine doesn't even crank on the failed attempts. Coul this be dead spots on the starter? It seems like it is heat related. Any thoughts?