Does this make sense

[jscomp]

I have a 2001 QX4 with 130K miles on it. Its been a great car requiring only expected maintenace (brakes, shocks and stuff). I finally did the plugs a few weeks ago and it ran like it was brand new. A week later I had the transfer case, front and rear diff fluids changed. Now, once its nice and warm if I'm sitting at a light the idle drops really low almost like its going to stall. It had been running like a champ until i had the fluids changed. What do think??

[Qxxx4]

does it just die or does it slowly alternate till it dies? it could be a misfire are you getting any codes/check engine light?

[jscomp]

It doesnt actually die. The RPMs get very low and the car shutters. No check engine light. I was concerned the fluid levels could be too high/low, since it started happening almost right after i had them changed. I would have gone back but had to be somewhere shortly after.