Q: How do I diagnosis engine stopping? on 1996 Chevrolet Express 1500

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Engine will quit at various speeds slow to highway. does not run rough. Will start right up after quiting.
Engine will quit at initial start of day and various times thereafter. Sometimes it is fine and will not quit during a day. Run diagnostic and no codes came up.
I am original owner. 85k miles. Van is used infrequently. Sometimes may go 2 weeks between usage and starting.
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