2011 Chevy Impala LTZ

I have a 2011 Chevy Impala. When accelerating from a stop it will frequently stutter then jerk forward. The first time this happened I thought someone had rear-ended me.

I’ve been to the dealer several times about this however they say they cannot isolate the cause. More importantly I can’t seem to get the vehicle to repeat this problem when I’ve brought it to the dealership.

How many miles are on the odometer?
What can you tell us–specifically–about the vehicle’s maintenance?
Is the Check Engine Light lit up when this problem occurs?

Does it idle smoothly? How does it run on the open road?

Your vehicle has a drive-by-wire throttle system.

This means that instead of having a throttle cable from the gas pedal to the throttle body, your vehicle has the throttle pedal position sensor that sends a signal to the computer, and the computer then opens the throttle plate via the electronic throttle body.

So the problem might be with the throttle pedal position sensor, the computer, or the electronic throttle body.


“Your vehicle has a drive-by-wire throttle system.”

Who in their right mind would ever call this a good idea? It must have been designed by an engineer who graduated at the bottom of his class.