I found only one ground wire on this truck it goes to the motor to the battery.
I am going to do like bogie said and run two ground wires one to each head. Then to the frame. Also going to clean the egr and see if that helps. But I was thinking on going with to big ground wires. Just because there are no other Grounds. I was looking at the wiring harness I didn't see any ground wires. I hope the heads will work.