flat spots between 2-3k RPM

**Dolphin S4** · 06-08-2016 07:15 PM

I seem to be having some sort of issue with my b6 6 speed s4 I noticed between 2-3k under any acceleration that's it's almost pulling timing or something. I hit flat spots every 100 rpm to 3k. The car kind of bucks sometimes it's that noticeable. Rest of the Rev range seems ok. Maybe down a bit on power but seems alright.

So the first thing to check was exhaust leaks so I went ahead and listened to both passenger wheel wells for ticking sounds (catless downpipes/FI catback/JHM 91). But everything seems good and tight.

So what now bad gas maybe ? Getting ripped off at the pumps? Any way to check octane level of the gas?

Or what else could I be looking at
No check engine lights on dash, new plugs, etc. Stock chains 120xxx miles

Thanks for your time guys

**Gosser** · 06-08-2016 07:56 PM

Have you checked for vacuum leaks?

**jakeoboy67** · 06-08-2016 08:00 PM

try doing a throttle body reset/running adaptation

**q_dubz** · 06-08-2016 08:59 PM

there's a whole thread on this recently. It seems quite a few people have this problem.

http://www.audizine.com/forum/showth...ing-hesitation

**Dolphin S4** · 06-09-2016 02:07 PM

Just to update this I'm almost 90% it was bad gas. I had a quarter tank and I filled it with v power. After a little drive It seems to pull strong again without hesitation.

Now that someone mentioned vacuum leak that will be my next thing to look at. It idles perfect though.

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