Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Unplug the EGR valve and see if the misfire is still there. If it is, then you need to do your testing at the speed the misfire is occurring to capture the it. While #4 is the verified one that's missing, try swapping components with #3 for example to see if the misfire moves with the parts. If it doesn't, then there may be a valve train problem.
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Here you go.
It appears that the EGR has either a bad transducer before the valve or the valve is bad. The transducer will allow too much vacuum if it's bad. You only need about 3 inches to open it. That's the hose you took off. If the vacuum is good, then the EGR has a weak return spring in it and then the EGR should be replaced, and it's a DONE DEAL.
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You are more than welcome my friend,