umakemekissu

Hi everyone, I'll try to be quick! I have 2 problems, any input is greatly appreciated.
1/ When I steps on the gas lightly to smoothly raise the RPM and accelerate the car, the car shakes. That doesn't happen when I step on it more aggresively.

2/ When I get close to a stop and start to release my gas pedal, the RPM goes down to 1,000 and then go back up itself to 1,500 (I feel like the car wants to stall) and then smoothly go down like normal.
When I actually hit the brake instead of just releasing the gas, the RPM tries to go up a tap but seems like it can't because I stepped on the break.

Any idea?? I'm a bit nervous Let me know if that wasn't clear!!