I changed out my leaking fuel rails and everything was working fine but when I went for a test drive and the car ran great but when I ran over a bump, not a huge one but enough to skip a CD, and the car just dies. Put it in park and the thing started back up no problems. The I parked it for a minute while I ran into the office and the thing would not turn over. Plenty of battery power but it would not engage the starter. The after a few minutes it started back up and ran like a top. Driving home came another bump and it died again. WTF???