1993 Vauxhall Nova Problems

hey there, iv literally spent weeks trying to diagnose an excessive idling fault on my nova today i eventually got an error code from it using the paper clip method........the fault code came up as code 33 which iv found is high voltage goi...

I have a 1.2 vauxhall nova and over the past couple of weeks the idling has got out of control. The car turns over and drives great but when its stationary the idling gets higher and higher to the point it sounds like im holding the throttl...