I have a 2000, I'm sure they are the same..take the four bolts off the top cover (the one that says 2.4 or whatever) and carefully lift the piece out...there are plastic and rubber boots attaching the cover to the plugs.
remove cover from top of engine
there are four spark plugs.
on the motor
4-cylinders have four spark plugs, 6-cylinders have six spark plugs, 8-cylinders have eight spark plugs, etc, etc, etc
under what appears to be the valve cover on top of the engine
Most likely it needs new spark-plugs.
4...under the coil cover
132 ft lbs. becarefull not to snap the plugs
It is located over the cylinder head.
Try changing spark plugs. Blow out dirt around plugs first.
my petrol 04 Grandis is about to have its first set of plugs as part of its 54K service.
the 04 have platinum plugs and they are preset