Mld1128

I've tried everything guys. Originally she said it was running rough. Started with simple stuff spark plugs, core packs, fuel filter, fuel pump, pcv valve, serpentine belt, vacuum pump, turbo feed line, turbo drain line, gaskets and o rings. I mean audi has replaced everything. My mom got to a point where she couldn't afford the last thing they wanted to try. The injectors. So I replaced them. They assured me that was it. Took me about 6 hours but got them in. Said a prayer before I cranked. But no luck. EPC light popped on. The car continues to jerk. Rough idle and hesitates vigorously. I don't know what to tell my mom dude. She said she's paid them at least $3800 so far. I thought I could help but I can't figure this one out. Any suggestions. Other than what we've tried. I'd really appreciate the feedback.