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If it does it a single time when you step on the pedal then that might be ok but if it does it again multiple times in succession every time you step on the pedal then that's definitely not normal.
Actually it is normal for the pedal to signal the TB with key on/engine off. Holding the pedal down (wide open) after a timing job or even an oil change is an easy way to prime the oil system as it puts the PCM in to safety mode and will not allow the engine to start. This is also how you find "dead spots" in the throttle position sensor and/or pedal sensor. Some people diagnosing TPS issues by themselves will usually put a full length mirror or such in front of the vehicle so they can watch the throttle blade sweep as they gradually press the throttle pedal. The clicking sound under the hood is the throttle blade going to the full open position if you mash it to the floor instantly.
 
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