I have a bucking problem once the car warms up and the lights also seem to flicker when it bucks. I was thinking it could be a bad ground somewhere, possibly related to the O2 sensor as well. Does anyone have a diagram of where all the grounds are?

 

I checked Shoebox's website for where the O2 sensors ground to and it says "Engine Ground". Any idea where that is?

 

The O2 sensors are grounded by one of the grounds on the LH front of the cylinder head at the coil stud.

 

You don't happen to have a picture that shows it do you?

 

http://shbox.com/1/ICM_cooling.jpg