Can someone point me in the right direction to find out what the spark plug gaps should be for a mk3 golf driver 1.8 1994 please, my golf is juddering slightly on tickover and thought checking the condition/gaps on the sparkies is first thing to troubleshoot.

Also, the tool you use to remove the spark plugs (not sure what its called), do they come in different sizes? A mate has one i'm gonna borrow but not sure if it'll fit,

Any info appreciated.