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Vacuum leaks are pretty common on the 3.2 due to intake manifold gasket failure that will result in high NO due to running lean. If your idle improves when spraying carb cleaner at the base of your manifolds, you might be too lean. If that's the case, take it in and have the CO adjusted and then it should pass.
Cheers,
Joe
87 Carrera that also failed for the same reason, but passed after CO adjustment.
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