(the spark plugs are located above the valve covers and UNDER a "COP", which instead of a typical spark plug wire you will have a Coil with a couple of wires coming from it.)
Try this site
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Remove the spark plug wires from your 2000 Chevy Impala spark plugs. Remove the spark plugs with a 5/8 deep well socket by turning the socket to the left. Reverse the process to install the new spark plugs.
you have to remve the intake manifold
This is a problem with this engine. Read the link below.
The spark plugs in a 2000 Nissan Pathfinder should be changed every 100,000 miles. This is a suggestion done by the manufacturer which is Nissan Automobile Company.
Every 30,000 miles except platinum plugs