10 what's wrong with Bora's electronic throttle cooling car not getting on the high speed?

10 Bora electronic throttle cooling car has no high speed because:

1, the throttle is stuck by carbon deposit, and the throttle is not closed tightly.

2. The throttle idle channel is blocked, and the air intake is insufficient when idling.

3. The throttle position sensor has poor contact and is not fully loaded.

4. The throttle position sensor has poor contact or the throttle body is damaged, and the throttle position signal is incorrect.