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I got rid of this on my personal car by turning off the "deceleration fuel cut off" with no noticable fuel milage change. However if most of your driving is highway milage it could hurt you. You may also have to add some to the tables for the P0068 "max airflow" tables. This is a test the ecm is constantly running to make sure the electronic throttle body is not stuck open. It checks the measured airflow against a series of tables and multipliers, including rpm, and map sensor reading, and desired throttle position. (something toyota should have spent more time on....lol) most people who are too lazy to spend the time to tweek these table just disable the test but this is not a good idea.... I have never personally seen one of the gm units stick but if it does you could be in for a wild ride. The first time I turned off the decel fuel cutoff I got this P0068 code and it only required about a 10% increase to get it to work.
I have also seen the popping go away after installing aftermarket headers and or aftermarket cats.
hope this helped...
chris
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