bullz eye you hit the bulls eye
vacuum leak.. get carby cleaner or whatever you call it over there and spray it around all your air pipes.. when your idle changes rpm theres your leak
never had the "stuck on full beam" before so i guess the switches have dirty connections.. try replacing it
never counted the teeth on the timing belt before so can't answer that one
do you have a light on the far left on? looks like a birdcage, roman building etc?
check your coolant level