Blazer453

Hi, I have a 2003 audi a4 1.8, I had the check engine light come on, so I took it to the shop, turns out it was the coil pack bc they were recalled. 2 days after getting the car back the epc light turns on a their is a loss of power when I accelerate. I noticed it came on after I came outta the car wash. I turned off after about a day. Then a week later I went to the car wash again, and both epc and abs lights came on. Again a day later they were off and the car drove fine. I wanted to see If getting the car wet was a fluke so I took it to the car wash a 3rd time and now both check engine light and epc are on. When I originally took the car to the shop, the codes came back to a throttle pedal sensor, but when coils replaced , no codes came back. What do u think the problem may be, maf, ecu, throttle body? Or what?