loud, and shety muffler
It is idling. This is hard for an engine to do smoothly.
Could be time for a tune up.
You probably need new rotors
could be a broken engine mount.
Rolling friction causes a car to stop.
out of balance
The most common cause is tire out of balance or bent wheel.
I just put a new battery and alternator in my car, but when i put it in gear or start slowing down to stop..the car die out. Also the brake light is continely on.
Adding heat causes gas molecules to vibrate, increasing the gas volume or pressure. A car with a damaged valve will usually vibrate noisily while operating. Tuning forks are designed to vibrate and thereby create a particular pitch.
If the tires are properly balanced plug tires should not cause a vibration.
Normally a bent wheel or tire out of balance.
You have warped brake rotors. Replacement or machine work is required to stop that condition.