Well I'm getting one today. Looks like a handy (yet cheap) tool that can be used for every car I have. Thanks for the great info so far everyone. I'll keep updating as things arrise as I'm paying very close attention to the way I drive and what I'm doing to casue the issue. Coming to work this AM the car drove like new (still in "W", running late).

I'll keep everyone posted and I'll order the code reader and see if there are any.