Vacume leaks will cause that listen around for any hissing or whistling and fix any if found.
It is your Idle Air Control Bypass Valve . It is located on the back of your intake manifold. Unplug electrical connector to it while idling then reconnect. idle flux should stop temporarily. It can be bought on ebay for between $100-$150.
Hi,
Please check your fuel line and has it cleaned ( if you have not touch the accelerator).
Seems your AFR is fluctuate changing that cause your car has unstable RPM.
Observe your fuel pump, filter (fuel and air).
Other things need to check : Your high tension side for 'half ( 1/2) faulty' .Your ignition cable, distributor and spark plugs must observe.
Your coil seem still working fine
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
-----------
Nissan Pathfinder Backfires?
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm?
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000
RPM?
http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.
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