New member, but have used Ih8mud forums extensively for trouble shooting/upgrades, thank you. I now have an issue I have not found a posting for. I have a 3B Diesel and recently installed one of Keith’s turbo kits (can’t recommend this enough, like a different engine altogether), idles perfecty, acceleration is better than ever, but at mid-throttle surges and bucks. Stops as soon as I accelerate or decelerate, but at consistent speed, in any gear, at any speed, it bucks/surges/pulses violently. I’ve bled and rebled fuel system, changed fuel filter, checked clamps on both hoses going TB, and clamps on fuel return line. Problem seemed to start after replacing fuel return line (cracked during engine install), could that possibly have anything to do with it? I pulled the hose and at idle fuel drips from the return so seems to be working. IP Diaphragm seems fine, tons of power, no problems under acceleration. Checked fuel cutoff adjustment, no problems there. Has anyone seen this before?