Hi, Im new to Audi, just bought an A4 1.8T B5, 1997 last three weeks. Everything was perfect after I sent it for service until last week it started to jerk. The problem is it jerks occasionally and its difficult for me to show the mechanic what the problem was. Sent the car for that fix and they first said there was a hose leak, replaced it for about 190. 5 minutes later the problem resurfaced and I came back and changed the power unit. Still not working, then they found another hose leaking i.e. they said it was the vacuum pipe. Thought that solved the issue but after 2 days the problem resurfaced. Any ideas? By the way, I sent the car to Everauto(malaysia).