hello Ive begun to notice a slight hesitation in acceleration when i put my foot down in second and third gear. From about 2k rpm to about 2400rpm it feels like the car inst pulling much at all but before and after the hesitation it feels fine. My car is a 1998 A4 1.8t quattro 5spd 143k on body and transmission and about 35k on its rebuilt engine. any ideas would be helpful this is my first A4 so im not sure if this is normal or not