Buy or borrow an OBD/CAN scanner/logger. Shouldn't take long to figure out which variables are out of whack and go from there.
I'd try cleaning the MAFs before going to all the hassle of cleaning the TBs. Dirty MAFs are a common problem and it only takes 10-30 minutes, a small wrench/nut-driver, and an aerosol can of cleaner. Easy job for even the least experienced weekend mechanic.
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