Mechanics stumped with vehicle shudder & dies, no check engine light or codes on 2004 Ford Freestar

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
Van dies sometimes & shudders while driving. The fuel filter, spark plugs & plug wires have all been replaced. Any thoughts of what to check? The check engine light has never come on & there have never been any codes either.
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Thanks. After doing some extensive online research, there was a TSB to fix this issue. Apparently water gets into the PCM.