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Hello and welcome to just answer. Well if you suspect the brake booster, then pinch off the vacuum line at the booster. If that affects the idle, then it is leaking and should be replaced. You can do that same test with any other vacuum lines coming off of the intake manifold. Keep in mind too that the TPS (Throttle Position Sensor) can cause. Idle problems on those engines.
Yes it could be a sticking IAC motor. I see more issues with the TPS than the IAC though.
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