My car had a problem at first where it would go into some safe mode a go way rich but only if I let off the gas at high speeds. It was caused the lower MAF getting air through it when the upper MAF didn't. We tested it by sticking a large piece of cardboard in front of the filter and it went away. We made a larger sheet metal air deflector and it all stooped. I don't recall what code it was giving but it might be worth checking, it was a cheap fix but had us stumped for a while.
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