Hi all my steering rack is cluncking when i wiggle he steering wheel i have checked the track rod ends out and there all fine, also my power steering pump is making a rattling noise and when i turn the steering wheel the engine revs drop by 300rpm and as soon as the rack clunks the revs return back to normal the pump also gets quite noisy when the revs drop, could this be a faulty pump or rack has anyone had this problem before Cheers Ben.