This happened to me last year. The spring behind the gas pedal broke. The spring at the top of the motor is not strong enough to do the job itself. I replaced the. lower spring with a 'close enough' spring and life resumed like normal. It is a pain to do as you have to go through the access hole above the assembly and hope your wrist and fingers are flexible and strong enough to do the job.
What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
