I just did my own, before I saw this page about it. http://www.4x4wire.com/Toyota/maintenance/tacoma_4runner_30k/maintenancep3.html#plugs These guys show step by step, pictures and even give you some great tricks to make things easier.
It always has the same number of spark plugs as it has cylinders. If it a 6 cylinder it has 6 plugs. If it's an 8 cylinder it has 8 plugs. If it's a 4 cylinder it has 4 plugs. Toyota doesn't make a 4 cylinder 4Runner.
It is probably your spark plugs misfiring.
I heard you have to take half the motor apart to get to them.
For replacement plugs, it is recommended to use stock Toyota Denso spark plugs. They are dual electrode and pre-gapped at 0.044". If the engine has been modified, the type and gap on the plugs may vary depending the modification and desired performance.
remove driver seat and panel below
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A 2007 Toyota Prius has 4 spark plugs.
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Matt
4 Spark plugs
The 2000 Toyota Avalon spark plugs can be located on each side of the engine. The spark plugs will be near the bottom of the engine. There are three spark plugs on each side.
how do I change spark plugs on 2002 Toyota tacoma v4