Just last night, I had a similar but more weird experience. While on the freeway, at stop and go traffic, I noticed my rpm at a real high level like around 2000. I literally had to hold the brake down with more effort during the stop and go traffic to keep the VX in control. I pulled the shifter out of drive and into nuetral and the needle jumps up to 2000 or so rpm. Once the traffic lets up a bit and regained to 60 mph for a few miles or so then coming back down to stop and go traffic again, the rpm drops real low this time. I pulled it out of drive and the needleregisters around 250 rpm. I thought that sooner or later the engine would stall out as the needle would hover within the 250 or lower range so I kept my foot o the gas just in case. Once traffic let up, the rpm settled back up to around 500 to 750 range (normal?). Hasn't done this behavior since.

Anyone else experience this or have any suggestions what the cause might be?