Stumble

[Dan DiBiase]

I've noticed a slight stumble during acceleration in my car over the past week or so. Basically, in most gears, when the car is
warmed up, there is a slight hesitation or stumble while accelerating - it always occurs around 2,000 - 2,300 rpm, regardless of
which gear I am in. It feels like an interruption in the engine power, or a hesitation. No CELs have come on, and the TB was replaced
at 75k miles (currently have 109k). Any thoughts on what could cause this stumble?

Dan D
'04 A4 1.8Tq MT-6
Central NJ USA