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I had a similiar thing happen, sounded it like if was coming from the intake, I disconnected the big vaccum hose at the throttle body and plugged it, noise gone, figured it was the oil sperator, while pondering the task at hand, i noticed oil spray on the rear fire wall, the filler hose was broke off, I disconnected at the middle section and plugged it and the noise was gone, new hose on order from Zims, $30 bucks.
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