02-chevy trailblazer- tranny/fuel issue

[z145]

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.

[maxwedge]

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.

[z145]

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

[maxwedge]

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.

[z145]

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