I CHANGED THE PLUGS AND FUEL FILTER AND USING 93 OCTANE. THE CAR ACCELERATES FINE, BUT WHEN I STOP AND GO THE IDLE IS ROUGH; BUT WHEN I HIT THE ACCELERATOR THE CAR SEEMS SMOOTH; BUT WHEN IAM IN BUMPER TOBUMPER TRAFFIC THE IDLE DROPS AND IT SEEMS IT WANT TO STALL; BUT WHEN I ACCELERATE SPEED ITS FINE. I WAS WONDERING IF THIS HAS AVACCUM ADVANCE ;

Bad fuel (water, too high octane, dirt, etc.), dirty fuel filter, air leak in system (fuel, vacuum) , too low octane, dirty fuel injectors are some possibilities.

I don't think it's a fuel problem. Sounds more like spark. Change plugs and wires, and possibly the coil pack. Also could be idle control sensor.

I'm not sure what the problem is specifically, but I can assure you this--you're basically throwing money way (and possibly exacerbating the issue) by using 93 octane fuel. Your car is timed and tuned to run most economically and with best performance with 87 octane fuel. The higher the octane, the slower the fuel burns. Longer burn time can equate to more power, but ONLY if your engine is designed and tuned for this application.
Couple of suggestions..checkto make sure your exhaust is "free". A plugged catalytic converter can really rob mileage. Tire pressure and air filter are worth mentioning as well.

Spark plugs in your car are good for 100,000 miles. try changing fuel filter and add a can of B&G 44K fuel additive. This stuff is the best on the market and only available at dealerships. It conditions fuel pump and injectors, also absorbs water in fuel (methanol). Try this first, your car is too new for any other problems. this should help drivability and fuel mileage. If Nissan does not have B&G, I know Toyota does. Also stay with 91 octane fuel. Check oil and coolant often. do not risk overheating in traffic, watch your gauges......

Could be numbers of things, get your self a bottle of fuel injector cleaner, pour all of it in the gas tank, and fill up with high octane 92 or 93, run it for while and see if change anything. Prob: Bad O2 sensors. MAP sensor, dirty plugs, bad/clogs injectors. If you have a high miles 100k change wires,plugs, good tune up would be good.

Your car is and will be fine - the lower octane fuel just predisposes the engine to
pre-ignition pinging (you don't want to make a habit of it, but its no big deal). Plus, by diluting
it with Ultra 93 octane, you raised the overall octane of the fuel in the tank to somewhere
around (87+93) /2 = 90. Happy motoring.

it may be idle control sensor or a bad mas air flow sensor--maf sensor in otherwords. or could be engine misfire at cold temp. start. only time when cold? or does run better when warm? try warming engine to operating temperature before driving,if problem removes it's self after warm up,up grade gas to 93 octane for 1 tank full. then see if problem goes away. it's cold where you are right? if so the fuel needs to be at least midgrade 89 octane fuel because 87 octane fuel will not start your honda correctly at cold temps. in cold weather 93 or super gas octane will start ,no problem,low octane fuel sometimes gels, or freezes at low temps. if in warm climate, change the fuel filter, add fuel injector cleaner to your fuel tank[preferablly lucas fuel treatment] this will lube your fuel injectors and give better fuel mileage. thank you for choosing fixya.com

WELL COULD BE CLOGGED FUEL FILTER.SCAN CAR COULD BE EGR VALVE OR FAULTY FUEL PRESSURE REGULATOR.

I had the same problem on my Z28. I replaced the battery (weak) and it solved the problem.