If anyone can help I'd really appreciate it. I have a audi a3 Quattro 170 sport back when i brought it i had a dpf fault with turned out previous owner had had it removed but not deleted so i have since had it deleted from ecu and at same time i had it remapped to 210bhp! But since this it hesitates under hard acceleration happens in 3rd 4th 5th and 6th between 2 and 4 thousand revs. If you accelerate gently its ok. I have put it into audi they had it for 2 days and can't find the fault. They have tried injectors, changed the fuel filter, and checked egr valve, and exhaust pressure sensor. Thanks in advance for any help.