engine issues 200 rodeo V6
 

hey guys,
i have a 2000 rodeo v6
i park on a hill and every time i start the car and backup out of the driveway i switch to drive to leave and the engine clicks and the car barely moves.. kinda stalls.
i push the gas down and then the engine kicks in real hard and then its fine...
anyone know what the problem can be?
i notice this happens a lot more when the gas tank is low rather then full... but it still happens when its full.

thanks guys!