You have to remove the throttle body/air intake plenum to get to the rear plugs. I believe the plenum is supported with two or three stays which are hard to see. You will need a new gasket for the plenum/intake manifold interface.One post on Toyota Nation Forum says that it can be done without removing the plenum. I think he is skilled at beating the clock at a repair shop.
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Like any car it depends on how many cylinders the car has. If it is a 4 cylinder then it has 4 spark plugs. If it's a 6 cylinder it has 6 spark plugs. An 8 cylinder truck has 8 spark plugs
To change spark plugs on a 5.9 2002 Dodge Ram 1500, locate the old spark plugs. These are located at the end of the 8 wires inside the vehicle's bonnet. Remove the old spark plugs and replace with new.
If you have platinum spark plugs, 100K. If you have standard plugs, 50K.