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Yeah just try crusing around at 3500-4000rpm in any gear. I noticed the vacuum on the egr hose occured more often when you accelerated a bit like from 65-70mph in 4th gear and then let off the throttle to enter into lean burn. It would then show up.
Its funny though because in 5th gear doing the same thing it wouldn't do it. Not even once with my car. And I drove around for 30 miles on the highway testing it.
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