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Hi. 2005 Buick LeSabre 244k miles.

Car started shuttering, and bogging down. Put it on the scanner and got the following codes: PO101, PO107, PO171; MAF, MAP, and lean burn. The problem is when I go to park it and test the sensor circuits, the engine surges, then goes back to normal idle then runs perfectly smoothly before I can put a meter on them. Does this condition point to one or the other sensors? Thanks in advance.
 

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Sounds like a vacuum leak somewhere. I'd look over everything and see if it jumps out, otherwise do some active tests while at idle, such as carb cleaner or listening around the engine with a tube
 
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