My guess is dirty MAFs but it could be a lot of things. Cleaning the MAFs is very easy, so I'd try that first.
Beg/borrow/buy and OBD/CAN scanner/logger (from $20 for a cheapo EBay unit to $100+ for a real fancy one; you can get what you need for $40-60 at most auto parts stores) and monitor MAFs, O2s, &c.
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