This could be a problem with your vehicle's Accelerator Pedal Position Sensor (APPS). Your vehicle's Power-train Control Module (PCM) uses the signal from this sensor to control the throttle plate and control idle speed and how much throttle is being commanded by you as you step on the gas pedal. In the diagrams down below I have included a description of your vehicle's Electronic Throttle Control System (ECTS) as well as how to test the APPS. The factory diagnostic troubleshooting guide for your vehicle's APPS will require you to use a multi-meter, so I have included a link below for you if you are unfamiliar with how to use one.
Please go through these guides, if necessary, and get back to us with what you are able to find out.
Images (Click to enlarge)
Saturday, July 13th, 2019 AT 5:25 PM