Definitely need to do both the pads and chains. Measure your cam deviations before and after. Consider replacing the solenoids because they are not externally serviceable on a 99. You may also want to do the lifters as well but they may make this job worth doing more as an engine out. You will need to make sure that you clean the mating services real well and clean out extra oil that is in the top end or else you won’t get a good seal. Make sure you don’t get sealant in any of the high pressure passage ways.
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