Hesitation on acceleration?
 

Didn't notice this until a few days ago, everything was fine until this.

On gear 3, maybe 4, the car's RPM starts to falter. As the car reaches 3000 rpm, the rpm needle begins to waver back and forth slightly. The car hesitates a bit until I press harder on the gas which causes the car to accelerate fine, or until I let off.

Is this a serious problem? Car seems to be fine besides this.

Plug in an OBDII scanner and check for faults. It may give you a clue.

Could be something like a faulty Mass Air Flow sensor.