Changing spark plugs

I'm sorry, can't get into repair procedures in this forum. You'll need to obtain a workshop manual for the vehicle from Buick or online at places like Mitchell One or All Data (www.alldatadiy.com). I would say that if you're asking for instructions for replacing plugs and wires that it might be best to defer to a professional near you. Plug and wire replacement is pretty basic -- it's a matter of access and having proper replacement parts available. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops