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on that engine, the most common vacc leak is at the lower portion of the intake (sometimes it takes parts wash or brake kleen to find it) at the r/h side in front. The intake splits in-two, and the seals at the split become hard and suck in air, quite hard to find. Fought this problem before, had to remove intake, reseal it and replace injectors (they all are supposed to have a high pitched noise, if any are dead or low, replace'em).
My two cents.
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