New plugs and flush fuel system, includes draining tank and fill with fresh fuel.
I believe you are "standing", not parked.
If your car is running when parked then it is burning gas. Cars use gasoline to run the engine.
Usually when parked at a speed trap or when stationary.
Because your car is running and they dont want someone to hop in your car and steal it
Diesels are kept running while parked for various reasons. In cold weather, a diesel may be very difficult to start so it is better to leave it running. Maybe the engine is needed to run heat or A/C for the sleeper cab.
Exhaust fumes may enter and that is not good.
You don't unless you are parked with the engine running. If you are parked and you want the engine running but don't want the daytime running lights on just shut the car off and set the parking brake then start the car back up. The lights should remain off until you release the parking brake.
Car alarm in Lexus ES300 started going off at random when car was parked, not running. I changed the key fob battery (flat watch battery) with a new battery and it fixed the problem.
Does yours have air suspension on it. You may have a leak causing it to sit lower when you are not running. Ford Expeditions with air suspension is designed to lower when parked for easier access.
If you mean the daytime running lights , just put your emergency / parking brake on when you are parked
If you are parked with the motor running, engage the parking/emergency brake. Turn the ignition off and restart the engine. The daytime running lights should not be on.
i'd have to say the person who left the car running. if they didnt leave it running they could have prevented the thief from smashing it into your car.