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And it has a HUGE impact on idle. Make sure everything is snug, including all hoses, there are a few in the area including brake booster hoses and off the balance tube. Boost and vacuum tests test differently, so its possible you would uncover issues that weren't revealed earlier. Gap on ngk plat SPs, check the CP part numbers, ohm them out, check codes, check everything electrical specwise from MAF to TPS. Soft valves would suck
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