I have been wondering if cleaning the mass airflow sensor advisable? Access is easy and all I have to do is spray CRC mass air flow cleaner over the resistors to remove the dirt. Here are the videos I have seen:   It seems that Toyota use the same design of sensor for most engines.  There is one video I won't post where the poster actually used a screw driver!  The only genuine MAF cleaning product CRC is recommended, though carburetor clean