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I had a very similar problem about 6 months ago. I to have the EVO High Flow Air Intake System and which I have been running for over a year now. Great Sound! Anyway I was getting the very same bouncing up and down idle but, no check engine lights??? Well I took some time and reopened the engine compartment to find that one of the clams that hold the tubs together had somehow come loose? I installed it myself and I made sure it was all tight but, I guess it came loose anyway. I reconnected the loose pipe where extra air was getting in and the problem went away.
Recheck all your connection up to the throttle body, sounds like a vacume leak.
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