ROVER pulls 75

Hi, I need help. I have a Rover 75 that's jerking, like it's going to stall. I don't know what it could be. It's been checked on a diagnostic machine three times and nothing comes up. The injectors have been checked and they're fine, and the EGR valve has been disabled. All the filters have been changed, including the oil. If anyone could help me rule out possible problems, I would appreciate it.