Where are the spark plugs located on a 2000 Toyota Sienna?

My van has over 80000 miles on it. I've never changed the plugs. The check engine light came on. It is running sluggish. (Chugging). I believe the plugs may be fouling but I can't locate them. Can anyone help me, please?Where are the spark plugs located on a 2000 Toyota Sienna?Below the cover,under the ignition coils,3 in front,3 in the back.Where are the spark plugs located on a 2000 Toyota Sienna?First, you should get the check engine light codes read first, then you can determine if that's what needs to be done.Where are the spark plugs located on a 2000 Toyota Sienna?the plugs are at the end of the plug wires.some cars have an ignition coil on each plug.