Sounds like a timing problem(flywheel key) sometimes the key will shear part way do to wear, flywheel key is located on crank end under flywheel, disassemble air housing to expose flywheel crank nut unscrew nut (impact) to see key and keyway slot in crank determine that key is not sheard and is in center of crank keyway slot. if sheared you will have to use a puller to remove flywheel from crank. install new key and reinstall flywheel with an impact gun .
it sounds like its starving for fuel, when it runs lean you will get backfires and if its running rough then it may be starving for fuel at idle. Try adjusting you mixture screw and see it the engine will smoot out. Your carb my be dirty and not allowing enough fuel through it.
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
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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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