my dad has a sierra xr 4x4 2.0 dohc on a k it is fine apart from one problem.When fired up on a morn. when drivin it is juderry and kangaroos abit and on the odd ocassion it may cut out.but once its warm it runs fine ant ideas?please help as its annoyin him and i dont want him to get stressed and get any more grey hairs!!!

 

come on does no body know about these motors?your not just cossie specialists are yous lol