What is the reason for the unstable idle speed, waste of oil and slight jitter of Jetta electronic throttle?

Hello, the reasons for your failure are as follows.

① There is something wrong with the engine air intake system.

② Idle speed control is not good!

First, check whether the engine air intake system leaks air. If there is no air leakage, the idle speed is not well controlled. Generally, clean the throttle and equip it with a computer! I'm glad to answer your question. I hope I can help you. Have a nice trip! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.