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They are under the coil packs. The rear three can be replaced easily with a male 25 torx socket and a 5/8 plug socket. However, the front 3 require removing the air intake plenum first. There are several sensors that need to be unplugged. Also the throttle linkage needs to be unhooked. Several bolts around the edge of the plenum that hold the oil fill, dipstick, support bracket, etc. Also the intake hose clamp needs to be removed. Finally there are seven bolts that hold the plenum to the intake. These 7 bolts have loctite on them that needs to be cleaned off and new applied during installation. Take your time and the plenum comes off easily. Be especially careful not to drop anything down the intake once the plenum is removed. The good news, Chrysler says 70,000 between changes so you don't have to do it very often. good luck
They are under the coils in the middle of the valve covers

A2: The rearmost set can be accessed easily under the coilpacks. The front set requires taking the air intake plenum off first. This is difficult but with patience it can be done by the average mechanic. Take your time and don't drop anything down the intake holes while they are exposed.

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Q: Where are the spark plugs on a 2004 Chrysler Pacifica?
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