You probably know this already, but restricted mode puts the engine essentially in open loop. so fixed low ignition timing, rich fuel delivery and no EGR if it has that system. BTW, if the engine has EGR and the MAF sensor does not clean it up, the next place I would go is to that system. I would disable the EGR valve and drive the car to see if it cleans up. If it is an engine with EGR and an electronic transducer to modify the vacuum, it may be allowing too much EGR on light acceleration that could make it bog. These type issues can be a bitch to work out sometimes. Sounds like your hot on the trail.
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