the LACK of LUBE or Graphte on the speed0 cable IF it's not an electric sending unit type. The speedo cable spins inside another cable. Moisture will cause rust after a few years and this will cause the speedo cable to start to drag and release. If you remove the cable from the back of the instrument cluster and squirt in some graphite, this should help with the bouncing.
If it is the same problem that appeared on my '04, it is going to be the instrument cluster. The speedometer is part of it and couldn't be changed independently. Mine started bouncing some when I would first start it up, then start working normal. I ignored that for a while. Then it got to where it would not move at all till I had driven some , then it would start working right. It finally got where it wouldn't move at all or just peg out. I had the cluster changed and that fixed it.
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