Change the earth strap then you have a know good one as they rot where you can not see they are a common fault, located passenger side engine mount area.
Wandering steering can be the radius are bushes, they should sit in the center of the axle mount if you can move them sideways with a bar they are shot.
Have you tried using the key fob next to the rear window to the right hand side of the tail gate as the ariel for the RF unit may be disconnected to stop battery drain.
Dont forget the dished washers on the pump mounts go a certain way they should dish )( that way not ().
and whey only need to be nipped up not screwed down tight