My car keeps accelerating to much would you happen to know whats causing it on 2001 Cadillac Seville SLS

It gasses by its self like if your pressing the gas but im not also it keeps overheating

air/fuel mix maybe. get diagnostic run to pick up any issues with air flow, fuel , or exhaust.
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my car did the exact same thing and I had the vacuum lines and water reservoir replaced and that took care of it.