crock

I have a very weird problem with my 02 3.0.

First of all I get hesitation when taking off. Seems to stumble along until I get into higher speeds and RPMS. That doesn't bother me so much as it only happens if I try to take off really fast. If I steadily increase the speed it's fine.

Here's the really weird part... If I'm going about 40-50 MPH and the RPM's are between 1400-1800 I get a slight stumble that feels like a misfire every 5-8 seconds. At the time it's in 6th gear. If I shift down into 5th gear and put the RPM's over 2000 then the problem goes away.

The CEL is not on.

Anyone else ever have this problem? Anything I should check on?

SloopJohnB@mac.com

VAG it and check for misfire...you might not have sufficient # of misfires to trigger CEL.

Could be/most likely is vacuum leak.

crock

You know what... Now that you mention it, I did have a leak that was fixed about 6 months ago. I noticed that after the repair was done that the check valve was no longer part of the vacuum lines. The people that did it are a reputable garage that's been around for a while.

Wonder if I should take it back or call them and ask about it. How important is that check valve?

This is the check valve that was part of the vacuum lines.

<a href="http://www.autopartswarehouse.com/details/QQAudiQQA6_QuattroQQKayserQQVacuum_Check_ValveQQ19 952004QQW0133-1638665.html?apwcid=P1135867996W43b3f85c7ab9e&apwi dPYrH32g">Vacuum Check Valve</a>