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The next time it doesn't want to start, try this:
Turn the key to Run, but do not crank the starter. Listen for the fuel pump, it should run for about two seconds. Turn the key back to Off.
Repeat this three or four times, THEN crank the starter. It should start immediately.
If this works, you may continue to use this procedure as necessary or you can have the fuel pump replaced. The fuel pump assembly contains a check valve. Its purpose is to keep the fuel pressure from bleeding off while the engine is off. Turning the key to Run makes the fuel pump run and re-pressurizes the fuel rail.
I can't even BEGIN to tell you how many times I have told people this when they ask me why their car is so hard to start after sitting (usually overnight).
The key factor being "Can you hear the fuel pump run when the key is first turned to Run".
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