I know certain 07 DMEs have been known to fail causing misfire issues. I don't know if that is what's happening here but you're getting no boost rather than misfires. It just seems impossible to have 0 boost and not be thtrowing a 30FF code.
Did he give you ANY codes that the car was throwing or explain how he came to that conclusion?
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"I'm not surprised you get along well with all the other neighbours. If you put fifty children with Down's syndrome in a room there is going to be a lot of hugging." David Thorne
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