Thread: MY GP running like a 4 cylinder car why?

I have a 00 gp gt wit 139 k and I know this car for running fast. Now my question is why is it running like the engine is heavy aka slow. I thought it needed a change of oil which I did and the same. Can any one help, what could it be? Could it be the engine? Because I hear this light noise on the engine like a whooping belt sound lol for real though but really really light especially right now since chicago its cold and one I turn that engine on I could hear that sound.

Also I want to know what happens if the oxygen sensor from bank 2 is messed up, what could happen if it gets worser?

Hope N e 1 helps thanks

there is only one bank on these, there are two o2 sensors- one on the rear manifold(the one critical to how these run and there is one after the cat. to make sure the cat is running right. Do you have a check engine light on? If so get it scanned and let us know the actual code number from it. If not, does it idle normally? Does it only feel slow under acceleration? any certain rpm range? all gears? When was the last time you checked your air filter to see if it was clean? Is it stock? When were the last time the plugs and wires were changed? What plugs do you have in it? We need more information and be specific.