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Not sure about Diesel engines but the crankcase should have a slight vacuum. Thus taking the oil cap off while the engine is running should make the engine stutter and almost come to a stop. If it does not you may have a good vacuum leak. Most likely the VCV (Volume Control Valve).
Once again it may not apply to a Diesel engine as I don't know much about them. If you post the last 7 digits of the vin, I can try to look up the symptoms on the TIS.
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