every time i turned on my car and waited for a few minutes for the engine to warm up, the car started to inject gas even i didn't press the gas padal, the long hand of the clock went up and down in the ........u know hehhehe... any suggestion?

 

Are you talking about the tachometer (the gauge on the left, next to the spedometer). The engine spins faster and runs rich to warm up the car faster during cold weather. As long as the tach doesnt go over 2000 rpm, its perfectly normal.

 

Do you mean that it is bouncing up and down? if so, how fast is it going up and down? does it go up and stay up? and then goes back down when the car engine is reaching normal operating temperature?

 

it went up pass 2000r/m i dunno what's happening? maybe the sparks? or something?

 

it went up and down really quick and then it stayed normal