Curious what adding a ground to the TB does? Never heard of doing that beforeI'd just remove it and clean it properly. It's only 4 5/16 bolts. Unclip the sensor and your ready to clean. I prefer maf sensor cleaner and a toothbrush personally. It's much safer on the tb. Try grounding it while youre at it. 4' of 10awg wire and a few terminals makes a noticeable difference. Connect one terminal to the top left bolt of the throttle body, and the other to the ground bolt on the passenger side close to the firewall. Your idle will be steady like you've never seen before