Help with ailing LS

[1sicklx]

I've replaced the plugs and the #5 coil pack as well as the valve cover gaskets as oil was leaking into some of the plug wells.

Driving the car it gets "jerky" on inclines and continues when stopped at a traffic light.

At times the power just doesn't seem to be making it to the wheels during all this.

Transmission? Torque Converter? Computer?

I reset the computer after swapping out the ignition parts and it's throwing a code (check engine light). I'm going to have it read at lunch.