I heard you have to take half the motor apart to get to them.
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.
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There are 6 plugs 3 are on the driver side and 3 are on the passenger side alone with the coils
24mm or use a 15/16 for a little tighter fit if its dorked up
u cant u need a machine that plugs into the ecu