02-chevy trailblazer- tranny/fuel issue

2002 Chevy Trailblazer, 100k- When your at about 45mph-60mph, the car will "buck" almost like its not getting fuel, after about 65-70 it comes out of it, and it doesnt do if from 0-45mph, When I was in overdrive and it was "bucking" i dropped it down a gear and it didnt "buck" anymore, along with the bucking issue, there is also a gas smell, I couldnt find any gas leaks from the tank, so I got 2 issues here and I dont know if they are related, any help would be appreciated, thank you.

Welcome to AF, a scan may point to the problem, bad plugs, a bad coil, low fuel pressure, bad 02 sensor are all in the mix here.

maxwedge, thank u for your response- I just had the 4x4 replaced and while it was at the Chevy dealership I had them hook it up there computer and it didnt throw any codes- does that narrow it down on what it could be?- thx

Codes are not the issue, looking at misfire counts, o2 inputs and so on are required to track down your seeming misfire, based on your descrpition.

replacing the o2 sensor is that something i would be able to do or is it best a shop do that? thx