HI all. I bought an ls back in September but haven't driven it because it needed some work. I replaced all the cooling hoses, spark plugs ,dccv valve, coils and valve cover gaskets. so yesterday was a nice day so I decided to take it for a 10 mile cruise, the car ran fine temperature was dead center the whole time , no missing from the engine and the trans shifted fine, maybe a little hard into first but not bad. Then the car started to beep when I braked for a light and would beep again when I hit the gas for the green light. its a single beep for the brake and a single beep when i take off.no lights on the dash to indicate what it was, it kind of freaked me out so I came right home. I checked my code reader and nothing was on it. I went out today and started it up and shifted it back and forth in the driveway, its not doing it now. Is this something to worry about ? The car isn't legal yet so icant drive it a lot plus its winter and I don't want it getting all salted up. 2003 ls v6 138000 miles