Hi My nissan Pathfinder 2006 model s vibrates when is on

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Get the suspension springs checked. Park the vehicle on a flat, level surface with no-one in it. Stand back and carefully look at the vehicle. Sometimes when a spring fails the vehicle will lean towards the broken side. The tail ends of the spring can break off when they are old and the broken bits don't always fall out when it happens.
The stall could be something separate. Do you have any warning lights on the dash? If the charcoal canister is starting to fail it often causes the check engine light to turn on as it will affect the emissions. This will trigger other engine sensors to flag up a trouble code.

2006 Nissan Pathfinder Service Repair Manual INSTANT DOWNLOAD

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Hi here's a link for the owners manual to 2006 nissan pathfinder.... CHEERS
http://www.nissanusa.com/pdf/techpubs/pathfinder/2006/2006-Nissan-Pathfinder.pdf

Are you in gear? What are the idle revs showing on the tacho? Have a scan done on the computer via the OBD2 port and see if any trouble codes identify problems eg spark plug, coils, etc.

check for failing "U" joints, loose /binding slip joint check for bent drive shaft check for missing balance weight off shaft.

check the "u" joints for looseness and wear especially the front drive shaft . check sliding splines . The vibration is a harmonic vibration normally associated with worn "U" joints --bent or out of balanced ---worn /seizing slip joints or being excited by a failing drive thrust bearing in the diff. ( big bearing directly behind the pinion gear that takes all the load on drive) check the magnet on the diff drain plug for metal bits.

Your motor mounts are either worn out or broken causing you to feel the vibration from the engine. Another possibility is that your exhaust pipe is touching the body somewhere.

That would be a u-joint that is worn out causing the vibration. Check for excessive play in your drive shafts,. The front drive shafts are common for bad u-joints.

does this happen between gear changes ?