I recently had a CIL for p0420. I notice when i take off it kind of jumps I guess you can describe it that way and then accelerates fine but then the rpms go to 3 or 4 and the car accelerates really slow. I fixed my catalytic conv. and both O2 sensors and it's driving much better but I still notice the rpm jump up and accelerate slow occasionally. could it be my transmission?

 

its most likely not a transmission problem but more likely an ait to fuel mixture problem.

 

Are you still getting or have any codes? Have the plugs been replaced.

 

plugs have been replaced and oil changed recently. Thanks for the help...