Has anyone here experienced any kind of "engine tic" with their 3v 4.6?? I've had an 07 Explorer since 08. It had 10k miles when I bought and I love the truck. It's my 3rd Explorer. I have always had the 'tic' noise. It is not any louder on start up or accelerating or anything. My father has an 09 that does not have this issue. Is this injectors?? Or something more severe?? Thanks for your help.