Timing, timing, timing. Usually, backfires, pings, funky acceleration and "dieseling" are all traced to ignition timing. In truth, a 4.3 is just a 5.7 with the back two holes cut off, so there's not a whole lot to mess with (unless it's MPFI, not TBI.... if it's the "Spider" injection system, God be with you.) Seriously though, perform a major tuneup, including plugs, wires, cap and rotor, fuel filter, and just for good measure, air filter. If the wires are cross-firing, or even just arching, that's a huge problem. Also, look at the plugs when you get them out - those are the best way to see how your engine is running. Just a yellowish/brownish discoloration generally means you're good. White means you're running lean. Black and that cylinder has been running rich. If you find a plug with a lot of carbon and/or black coloration, check that cylinder's ignition wire. Probably been arching out.
Lastly, don't be cheap. Get the best wires you can afford. Going with economy, "green box" wires would be like doing nothing at all. When I was a wrench, customers would come in after giving their vehicles a tune up, and the new, cheap wires were as bad as the old ones. At night, under the hood, they literally arched so bad they looked like a strand of Christmas lights. And, MAKE SURE TO KNOW THE FIRING ORDER!!!!! Easiest way to do a wire change? One at a time. After that's all done, and if the problem persists, check the timing. In fact, check it, or have it checked, anyway.
Good luck!
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
Here are the most common causes of idle surge, rough idle esp when cold, other symptoms include stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake
Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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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