I had been considering this very action. My AZG has the same condition-- I'm considering an ECM replacement, but would like more input confirming the cause before dropping the cash.
To determine the P0102 cause, try this:
Take your ride out on the highway and, with the scanner connected and reading the airflow in grams/sec, run up to redline in 2nd gear. Take someone with you as a scanner operator/reader
IIRC, the AZG is 115hp, and nominal spec for a MAF is ~hp x .8, so you should see ~92g/sec (115 x .8)airflow at redline. If you see significantly less. I'd suspect the MAF.
See this thread on fuel trim:
Let us know what you learn.