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Could be the fuel pump getting weak...My girlfriend's 95 would turn over alot in the mornings after sitting all night before firing, and occasionally wouldn't start at all. But once she drove it to school, it would start right up the rest of the day. The fuel pressure in the lines drops back down after sitting all night, and the weak pump was having trouble getting fuel to the motor quickly. But during the day, since it's being started alot more, some pressure remains in the lines. I put a new fuel pump in hers and it starts right up everytime now.
 

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i had that issue when i had my 98 yukon. if it was early in morning, dont know why i would crank and crank and it wouldnt start. but after a while then it would start after a few hours. but after i actually looked into it, i had a leaky fuel injector. I used to pull a fuse in the truck, i think it was the fuel pump, crank the truck so motor clears fuel out, plug it back in and crank and it would start.
 

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JUGS Racing
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Why not check the fuel pressure first instead of throwing parts at it? Or take it to a shop and have them look at it?
 

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Try letting your fuel pump prime a few times before starting it. That would rule out weather its the fuel pump or not. Also if the fuel pump is really loud while its running, that would be a sign.
 
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