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Originally Posted by bluebenz
Because its dirty Steve.
A dirty throttle body can cause problems with idle since the dirt
can cause the throttle body to stick even if you have a clean
AF meter, ICV, and sound idle air circuit hoses.
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Point is, how do you KNOW it's dirty? I've cleaned many throttle bodies in other brands where clogged idle bypass circuits and other complexities are easily affected. Your throttle body has none of that - just externally accessible wear/lube components. You can't see it without removing all the much more vulnerable hardware, so if the throttle body needs cleaning, you can be sure the airflow meter and is a mess. THAT you can see, inspect, perform some cleaning, and decide if you need to dig deeper just by removing the air cleaner housing.
Steve