Yes, bad lifters can cause rough idle due to the inadequate amount of oil pressure they supply to the valvetrain components. This lack of lubrication can cause the valves and other parts to stick and move erratically, resulting in a noticeable decrease in power output and an engine that is difficult to keep running smoothly at low speed. Additionally, if left untreated for too long, bad lifters can cause further damage to other components such as valves, camshafts, and connecting rods.