This throttle surge thing happens nearly every time that i pull into my driveway. I think it has something to do with my car going uphill, then downhill. I drive up a bit, push in the clutch to roll it down in neutral and the rpm's jump up to around 3-3.5K
It's also strange, but i only encounter the moosing problem at night, and it is really obvious. It is good and loud and usually occurs off and on the whole drive, maybe every 2-3 minutes.
I've never had a moosing problem during the day. Wonder why...