My VX does this every few months. If I drive to several places and it sits in the sun on a really hot day for about 5 minutes while I run in to some store when I come back it starts fine but then stalls several times in a row. Finally the revs will stay up and it gets back to normal and I don't see it again for a long time and forget all about it. It's good to knowI'm not the only one and it would be even better to find out the cause and cure!