Stalling, power loss, backfiring

Unless you do your own work take to a reputable technician and have them re scan and change required sensor
the forum below may shed some light on your problem
rough idle stalling loss of power

Sounds like the timing may be off. I would need to know what engine it has to help you diagnose this better.

Engine system needs inspection on case of backfire:-----

Check out related help links to troubleshoot the vehicle backfire issues:-----

Feels like backfire from engine when decelerating?

http://schematicsdiagram.blogspot.in/2012/02/feels-like-backfire-from-engine-when.html

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Jeep Backfires?

http://technoanswers.blogspot.in/2012/02/jeep-backfires.html

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Nissan Pathfinder stalls and bucks on Acceleration?

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
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These will help.
Thanks.

If it was a two cycle I'd say it was clogged exhaust ports. But you have a pretty exotic bike. So I guess it's a timing issue dealing with the exhaust Ox sensors.

get the egr valve checked, place to start

sound like its missing
check sparkplugs wires and coil pack for fire if not that run a compression check

the symptoms indicates lean mixture. you have to clean the nozzles and the throttle body without doubt.

Most of the time if it was a fuel pump it wouldnt start at all.Sounds like a tps problem.If there is a check engine light on, it would probably be cheaper to pay someone to scan it, instead of guessing and buying
sensor after sensor.Some of them are quite expensive.
Hope i was of some help

Your timing belt could be broken. You want to have this checked as soon as possible to prevent any further engine problems.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_62314e5b2470e8b5