In between the injector & throttle body area, some may found an o-ring with interesting shape, not many looking for that o-ring as that area may not dismantle so often compare to other area, some call that as Idle Speed O-ring, or some call them as Idle Control O-ring.
Those O-ring may be also is the same type of items for various model, just like quite some Toyota model using the part number 22215-7A680 and Mitsubishi tend to use MD615500 or MD614680.
Gasket is very important.
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