paul here is a wee piccy for you the engine should be similar to yours mate !
i have badly drawn a wee blue box on the pic !!
that box shows you the location of the idle control valve !
what you do is disconnect the black electrical plug and undo the 2 screws at the side of the unit
and clean it in brake cleaner / carb cleaner /wd-40
once clean refit and bobs yer auntie !!
hth mate !