Check for vacuum leaks. Check for any disconnected vacuum hoses. I have the same code but it comes on once a week after I clear it. I cleaned the MAF meter yesterday with electrical motor cleaner spray, then sprayed it with electronic contact cleaner. I test drove the car last night and it seems to run better. I didn't get the pinging at high rpm that I usually get from running lean. I haven't driven it long enough to verify that MAF meter was the problem but I will post in a week or so if the problem has gone away permanently.
