SO today I was getting the maint req light with 10 flashes. I took it and got the code read and it is the ERG valve according to the guy @ auto zone and the FSM. I took it off and used some carb cleaner to clean it up and i got a new gasket for it. The question is at 138,000 should there be some other way to clean the motor up of all the carbon that is built up with in it?