electrical issues

[bramaxval]

Hello everyone, I'm new here. I purchased a 2007 Quest SL in March of this year. I've been having some electrical issues with the van and was wondering if it's a common issue and if anyone knows a fix for it. On occasion, the van won't start right away. It does start up, but at very low idle, then shuts off. If you wait about 5 minutes and try again, it starts like it never had a problem. Next the speedometer will get stuck at different speeds when stopped. It will then start from that point and add what ever speed you're driving. ie it will freeze at 40, then if you're driving 35, the speedometer reflects 75. I've found that disconnecting the negative battery terminal for a couple seconds rectify's this issue temporarily. The next is that my back up sensors are not working. I need to locate the fuse for this and see if that is the issue, but I'm at a loss on which fuse it it.

Any help would be great,

Thanks!