Why is my car accelerating on its own?

I have I 1993 Honda del sol(standard) I started having problems with it last week beacuse it was over heating and I still drove it like that I made sure it had water and everything should of been working fine but last night it over heated again when I got home from work. This morning I turn the car on it start accelerating on it s own without hitting the gas. I ve never seen a car doing that I don t know what it could be. Can some help me?

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