I have a 1999 Chevy Ext cab with a 5.3 and automatic. Its making a clicking noise, almost like the sound of my four way flashers but louder and faster. I'm not sure what it is. It hasn't affected the way it runs that I have noticed. My emergency brake light and the ABS light usually come on after driving it for a few miles or sometimes instantly and sometimes won't come on during a short trip. Has anyone experienced this with their Chevy and if so how did you repair it? Any help will be greatly appreciated. Thank you in advance.