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Old June 2nd, 2020, 09:19   #9
QuickTD
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Join Date: Feb 2002
Location: SW Ontario
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The problem is manifesting only at light throttle, indicating a lack of boost at low engine speed and load. Most likely culprit is the vane control system. I'd check vacuum lines again, and possibly replace the N75.

Plugged cat would be worse at high speeds and bad injectors are virtually unheard of, at least until you reach 400-500k.
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