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I don't have an answer, wondered myself what makes it do that, but surprised out of all the thoughtful knowledgeable users no one would even venture a guess. Hang in there, some brave soul will come through with some places to look to help resolve your issue.
Your MAF sensor is junked. Get a new one. You can try cleaning it, but it is better to get a Motorcraft. If a Motorcraft one is not available, try to get a Standard. Hope that helps.
If indeed it is the MAF sensor, second the motorcraft brand although more expensive, put new life in my 94 4.0 when codes showed sensor. Runs like a top now.