My friend's truck was not idling properly (it would idle erratically and stumble when pulling away from singles / stop). If you revved up the motor and let off on the throttle, it would stall out. Fuel pump was also constantly running with the key turned to "ON", which is not normal. This video cover diagnosing the issue and taking apart the Toyota AFM in order to help free up the internal door from corrosion so that it will move smoothly, not bind and operate as intended. This is important to smoothing idling and functioning of the 22RE because the AFM provides information directly to the ECU as far as air quantity entering the motor (aka metered air). The contacts shown inside the AFM are also responsible for turning on off the fuel pump via the circuit opening relay.

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