Sometimes when I'm driving in heavy rain the speedo starts to flick downwards about 10 MPH then goes back up to the speed im driving at. It's like...flick..flick.....flick. Could this be water shorting the VSS out or something? Oh, im not sure but I think the faster you are going the worse of a flick it gets...like on the highway once it totally dropped to 0 MPH and didn't move for like 30 seconds...while that happened the Odometer also stopped moving..but It came back up. Any ideas?