I have a 99 Silverado with the 5.3vortec, and ever since I put a new fuel pump in it, my security light, along with low fuel light, and battery light flash all the time. The fuel gauge also quite working. The truck runs, but sometimes the alarm goes off when you open the door, even when it's not locked. It's like it has a mind of its own. Lol Has anyone else had this problem ?