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Vacuum at idle?

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Hi All

I am trying to track down the root cause of my low rpm pinging. Can anyone tell me what the vacuum should be at idle? (2.3 LPT, auto) Also at a steady 2000rpm (in neutral).

My thoughts right now are either clogged cat (previous owner had replaced the turbo, but cat was not replaced - assuming oil contaminated/clogged) or a small vacuum leak I can't find.

Scott

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