So I'm driving in the hot city w/the A/C on and while stopping, my 240 startes to die. It was not wanting to idle. I catch it and manage to get to my destination. 7 hours later I leave and it's acting weird at idle. Like "pulsing". I drive home and don't seem to have any problems. This morning, it starts and idles but still with the pulsing. Not bad, like high revving, just a gentle pulse like it's catching itself from starting to die then speeds up a liitle and levels off then repeats the cycle. I changed the O2 sensor 2 months ago so that shouldn't be a problem. I'm going to check the Air Filter. Bad Air Mass Meter ? Any suggestions?

Joel