The EPC light is on and off and the engine light flashes ...

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP. Thank you for your reply and that information as this does help me better understand the situation. I’m sorry to hear you are having this problem. I know this can be frustrating. Please give me one moment to type out some info for you. I’ll be right back! A live optional phone call will be automatically offered by JustAnswer, you can accept or if you decide to decline we can continue with text until you feel the live call would be better suited to you. I will try to help you on this here

your first step will need to be having it scanned and get the fault codes and based on these codes we can pull up a pinpoint troubleshoot and be accurate Now the Electronic throttle body, components in the system, wiring to it or ECM or ECM connection With that said on , most of the time the TB body will need to be replaced or wiring to it , in high mileages vehicles, we see ECM or ECM connection issue Please click on the link to view the PDF file on how to test the EPC and read below a small description on system if get the fault codes, you can post them back here for me and i can pull up the exact troubleshoot and send it to you baed on the fault retrieved 2009 Volkswagen Jetta GLI (1K2) L4-2.0L Turbo (CBFA) Electronic Power Control System (EPC) Function **Function of EPC system** For "EPC", the [throttle valve](https://my.alldata.com/repair/#/repair/vehicle/49706/component/355/filter/) is not operated by a cable from the accelerator pedal. There is no mechanical connection between the accelerator pedal and the throttle valve. The position of the accelerator pedal is communicated to the [Engine Control Module](https://my.alldata.com/repair/#/repair/vehicle/49706/component/228/filter/) ([ECM](https://my.alldata.com/repair/#/repair/vehicle/49706/component/228/filter/)) via two sensors for [accelerator pedal position](https://my.alldata.com/repair/#/repair/vehicle/49706/component/1351/filter/) (variable resistances; stored in one housing) that are connected with the accelerator pedal. The accelerator pedal position (driver's intention) is a main input unit for the ECM. Operation of the throttle valve occurs via an electric motor ([throttle valve actuator](https://my.alldata.com/repair/#/repair/vehicle/49706/component/1352/filter/)) in the [throttle valve control module](https://my.alldata.com/repair/#/repair/vehicle/49706/component/2078/filter/). This is true across the entire [engine speed](https://my.alldata.com/repair/#/repair/vehicle/49706/component/2608/filter/) and engine load spectrum. Please Read Below How to Get Back in touch with Me You Can Always Come Back to this Conversation and Ask Me any Follow up Question you May have on this Issue (You can Copy this Link Page & Paste it in your Browser when Ready and it will Open up our Conversation Again) or there should be a Tab on your Screen to Add me As Your Favorite Expert I'm Online Daily from 7 Am Till Late Eastern Time Zone Thank You?Chad Farhat?ASE Certified Technician

I did and it showed a vacuum line fault and cylinders 1,2,and 4 meaning bad coil. Got the parts and if I have any questions I'll let you know

Ok that sounds good