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first of all you have to consider several things. 1. what is the mileage? if you have high miles you will want to change the valve cover gaskets. The reason is you will need to remove the plenum to get to the plugs and you will want to do this right the first time. 2. change your plugs while you are in there. This is very easy to do. It looks intimidating but invest the time and you be surprised how easy it is. I just did the timing belt, guide, tensioner, hydraulic tensioner, water pump, valve cover gaskets, plugs and plug wires and fuel filter and my montero runs like new with 140,000 miles.

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