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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
It sounds like you are saying that once it stays running that putting in and out of gear no longer has an effect of stalling the engine and thus the problem is only cold starting or initial starting. For this I would start by checking the cold and hot compression readings then move on to fuel pressure key on engine off, key on engine running (during problem) and once problem no longer exists as well.
Thank you!- Joe
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