I have been experiencing some lag in acceleration with my 2001 4.2L Quattro. Any ideas?

 

should be no lag the 4.2's don't ahve any turbos unless it is a RS6 but get it sacned for codes to see what the problem is

 

I'm not familar with A6..but it might be the DBW/ECU.....The S4 has a .4 sec lag in acceleration that is part of how the drive by wire and ecu interpert and react to full throttle acceleration. This may be a 'feature' that is on more than one Audi model.

 

There is a little pause in the acceleration. If I just tap on the gas, it really feels like its going to take off but if I put the pedal to the floor, it just chugs a little bit and not as fast as I would expect from such a larg engine?

 

Na , thats sounds normal.
Ive drivin my buddies dads SL600 and it even had a split second of hesitation.

 

That is exactly what I get on my car...and that is the DBW/ECU. It is normal behavior....