factory recomends every 30,000 miles or 60,000 if you are running platinum plugs.
its a Nissan for starters but it could be the plug wires or the plugs or the distributor
Replace it
Your spark plug manufacturer would recommend your replacement schedule.
unscrew them
On a 19 year old vehicle I would suspect you have a vacuum hose that is leaking. Replace all under hood vacuum hoses.
normally around 100K
They are under the ignition coils. 5/8" socket and 8 " extension.
This is for the '05 Frontier, but should be what you're looking for. http://www.clubfrontier.org/forums/f23/how-change-spark-plugs-2005-gen-2-frontier-40507/
After 105,000 miles. Nissan Maxima spark plugs are platinum-tipped and lasts for many years.
No. Points went out decades ago.
It can be complicacated since on some models the spark plugs are difficult to get to but I would recommend to find the spark plugs first and then double check to make sure you know where they are.
2000,nissan frontier speakers size-------6 1/2 Try to use the Nissan speaker adapters plugs so you don't need to cut wires and mess up the electric system, you can get those from eBay or amazon.