This almost happens to me, except mine doesn't quite die. I've heard a range of solutions to this; anything from cleaning your MAFS to clogged 02 sensors to changing your air filter to it being a faulty (dirty) valve somewhere in the exhaust system...
I'll be doing a regular tune up (rotors plugs wires distributor and fuel filter) in the next few days in hopes of it solving my poor gas mileage and fluctuating Idle issues.
<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'> good luck!