2000 s4 6speed when I'm driving the car no matter what gear I'm in right around 3k rpms it bucks me like the engine sputters
any ideas but only when I accelerate quickley if I gradually push the gas it doesn't do it I emptied the tank and filled with premium feul and some dry gas and fuel injector cleaner too I'm at a loss and I just bought it little pissed

 

Sounds liketheengine isnt gettin enough fuel,try a bottle of fuel injector cleaner.

 

I dont know much about S4 but i had an A4 for 4 years and my car did that it was the inigition coils. All of them went bad and it bucked all the time.

 

only HADmy audi maybe two months but it could also be a bad fuel injector.....they dont always unclog when you put cleaner thro them or they become worn

 

doubtful its the fuel injections (in my opinion). id go with AudimitriS4 on this one and say its probably one of your coil packs....a lack of fuel, unless its all injectors, shouldnt cause a noticable shudder....however, one bad coil pack can.

 

My Y2K S4 had the same problem. For me it was a simple boost leak. And it always happened right at 3000 rpm too. I had a torn TBB. I think it was a $34 part that you can easily put on your self.

 

Yeah I was gonna say...check for boost leaks first.

Perhaps also a quick look over the MAF to ensure it's clean...then if no luck start looking into coilpacks/further diagnosis etc..

Good luck.

 

I was showing off my S to a friend once and under full throttle at about 3000rpm's the power would just drop off then pick up about 100 rpm's later just as strong. It happened maybe 3 or 4 times in a row and now i havent experienced it in over a year

 

if it only bucks when you give it boost but not under normal light driving, it's an ignition issue and not fuel.

The car when building boost also advances the timing, you probably have a worn plug(s) or bad coil pack(s). I bet it's getting spark blowout. I'd change all 6 plugs first since those are cheaper than the coil packs. Then if it still does it you can test the resistance in the coil packs and see if one or more is out of spec and then replace them.

Are you getting a check engine light? If so check the code it will tell you which cylinder is misfiring and then you know what coil to look at after you change the plugs.