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I'm sorry I missed the opportunity to talk to you on the phone. Does the engine die out while it is running or just have the problem not wanting to start? Is the engine warm when it has this cranking but not starting problem or does it happen first thing in the morning as well? A bad crankshaft position sensor will normally cause a problem of not restarting when the engine has been shut off for awhile or short time. Once the engine cools down enough, it will eventually restart. Does this sound like the problem you are having?