Car jerks when switching gears most of the time. Mostly noticed between 2nd & 3rd AND 3rd & 4th gears. If I am very gentle with the gas pedal, the jerk is very minor and sometimes unnoticeable. At constant speeds, the RPM spikes on its own without me hitting the gas pedal. To confirm this, I drove the car on the highway multiple times with cruise control set to 60 MPH. RPM will be slightly over 2×1000 for most of the time but periodically spikes 50-100 RPM over this constant mark.