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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
Check the EGR ports (intake and exhaust with the valve removed) for carbon build up blocking any of these ports.I find this most common for this issue here and had to clean out all carbon build up to correct this fault.If this has already been checked or done let me know so we can continue from here.
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