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2004 Isuzu Rodeo - Need throttle body and gas pedal - HELP

We were told we needed a new throttle body and gas pedal for our Rodeo. First, do we need both parts, and next, WHERE DO WE FIND THESE PARTS??? This car is dead in the driveway until we can find the parts. HELP PLEASE!!

Who told you, and why? What are the symptoms?