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On the occasions when it won't start.......when you turn the key to the ON position, do you hear the buzz of the fuel pump priming? Do you notice if the car won't start after it's been in the sun and the interior is warm, versus first thing in the morning?
 

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As you're cranking, fuel would be continuously sent from the pump until it eventually built up enough pressure to fire.

If the EGR is stuck open, that would do it too. It would be the equivalent of a huge vacuum leak until the engine was up to operating temp.
 
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