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?

Is the check engine light on? It might be a bad Idle Air Control Valve, Bad Throttle Position Sensor, etc. It might even be the Coolant Temp. Sensor. Since you said you had problems with overheating.

Could be a vacuum leak, also. And, a vacuum leak could also cause the engine to over heat.

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