Stanley Harris

Hello a few weeks ago my epc light came on. Car stalled would not accelerate or nothing. This all happened after I had a fuel system clean done. When it came on I got to my destination and 1 day later it was fine now issues. Two days ago it came back on. I turn car off it went away no problems. Now it's back on won't turn off and I can feel misfire when I try to accelerate. I've read many articles. Some say ignition coils. Some say speed sensor others say fuel pump.... The check engine light is also on. I have a 2007 Audi A8L 4.2 Quartto.. Any suggestions before I let my Audi dealership take me to the bank?