oki have 2005 gp 135000 miles series3 base model.power steering is whining and slight clonk in front end over small bumps.my car idles @500rpm in park too low?when i push pedal front end feels like its gonna fall off.higher speeds it sometimes gets better.new pads,new rotors tires new in feb.could it be rack and pump needs to be replaced?when i accelerate power steering is better but front end shakes. why is idle so low?also ipopped off ps cap and it felt like pressurized in reservoir?? any help woukd be great not lots of cash trying tio solve as cheap as i can .please help