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Why did you replace the IAC (what do you mean by shot?)? Any codes in the computer?
I've replaced a lot of intake plenums. It's not the intake itself but the rubber extension that goes from the manifold to the water pump housing/ throttle body. They get a small crack in the bottom that you won't be able to see. When the crack develops they tend set lean codes p0171 and p0174 and they can also cause the idle to fluctuate, surge and stall.
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