Q: car accelerates on it's own

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Over the past 2 months when driving at low speeds (under 40mph) my car accelerates on it's own. I apply the brakes & all is well. I called the Toyota dealership and they acted like I was an idiot. Said this was an issue they never had to address and informed that when I had my car in drive at a traffic light I must keep my foot on the brake. I explained that it was when I was driving. He said he had NEVER had this problem....I hung up!!!

My car has 23000 miles.
My car has an automatic transmission.

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