it does the same thing on both battery and when i first got it dident do that
Right, that would be consistent with a speed controller problem. The Electronic Speed Controller (ESC) connects to the battery, the motor, and the receiver. It governs the speed of the motor by regulating how much juice goes to it based on input from the throttle control on your transmitter.
On some park flyers, the ESC and receiver can be combined onto a little controller board.
It sounds like you're having problems with that particular component in your Parkzone airplane.