OK, folks, here's my mystery for today...US market Kia Sportage 2.7L v6, auto, AWD, 150k miles. It has started doing an intermittent (like once a day) stumble/stall. No codes, no CEL. It only does it when I am off the gas, say coasting down a hill or to a stop sign, and won't do it if my foot is on the gas at all. The first day I noticed it because it felt like the transmission was downshifting and acting weird as I coasted down a long hill, then it died when I made a left turn with very little gas in the tank. That made me think the fuel filter was getting bad, so I changed it...went ahead and changed the fuel pump too since they are cheap, and both are in the tank. That made no difference, and without an OBD code coming up, I don't know what my next step should be. Any thoughts?