Hesitation

I have a 2000 impala w/3.4l , When I'm driving and hit around 35-40 mph

I get a hesitation/flutter for a second then it runs ok.

Does anyone have a clue?

well i had the same prob and i got my tranny replaced its gone now......good luck :/

well i had the same prob and i got my tranny replaced its gone now......good luck :/

Had that prob 2. My catalytic converter was clogged. Got it replaced No prob now. Hope this helps good luck.