When it is around 60-70 degrees out, my car would almost always coast-down a little too much and almost stall. Now it's actually stalling almost everytime it coasts down when it's around 60 degrees out (It's been 60 for the past 2 days). What could be causing this? Might running some gas cleaner and a tank of higher octane gas correct the problem? (I use regular 87 octane normally). It's a very annoying problem, because it mostly happens when I have the clutch disengaged and I'm coming to a complete stop at a stop sign. It also happened when I slowed up for a slight-turn when I was deciding for a split second what gear to go into (2nd or 3rd). It's a serious problem when you think about if someone was behind me when taking that turn.

My idle is completely normal, as I've had Nissan clean my TB, I've changed my O2 sensor and fuel filter, and had my MAF checked by Nissan a little while back.

If I remember correctly, someone else had a similiar problem and it was a clogged up EGR system.

Khiem

Check your base idle setting.

The ECU can only raise the idle from this setting. If the base idle setting is too low, the engine can stall before the ECU can correct for the low RPM.

It isn't correct to assume that since your car is idling fine that the idle is set properly. You need to tell the ECU to not adjust the idle, then check/adjust it to the necessary value.

The base idle RPM changes due to a dirty TB, or dirty AACV valve.

Lastly, if you still have problems after the above, check/adjust your TPS setting, and check your MAF ground.

Have you replaced your PCV valve lately?

That could be the problem and is a cheap fix. I had the same problem and did the following: clean egr, reground MAF, replace pcv, reset idle. That helped for the most part. The idle still dips a little when I slow down, so I suspect I'm still missing part of the equation. But, the above took care of most of it.

Thanks for all the help guys. I appreciate it. This is what I'm going to do, since today it's about 50 degrees out and the car is running fine.

1) throw fuel system cleaner in when the tank's almost empty
2) fill up with 89 octane (I normally use 87)

Then Wait until it gets warmer out and see if the problem happens. If it still does I will disconnect the vacum hose to the EGR and plug it up and see if the problem still occurs.

If it doesn't happen anymore, I will clean or replace the EGR.

If it continues to happen with the EGR disconnected, I will follow the advice given to check my base idle setting and check out the PCV. The Haynes manual explains how to check to make sure the PCV is operating correctly.

Thanks again everyone.