after we finished the h/c/i install on my mustang the power steering hasnt worked. we tried 2 different pumps now and still has the same problem. the power steering will work if you rev the car and turn the wheel but not if your sitting still. and when you turn hard it will jerk from time to time. but for the most part it doesnt work. its been like this for months now so i know all the air has worked it way out and there is plenty of fluid in it. any ideas?