Good afternoon

I'm having an issue which I hope I can find some info. My 2007 f150 lariat will turn on and when I go to turn it over I hear a slow click from the passenger side area. I turn it off then try again, sometimes it starts after a slight delay other times It won't start at all. I replaced the battery and same thing. Any ideas? I was considering the solenoid in the starter? Thanks

 

The passenger side click tells me it's something with the intertia switch/fuel cutoff switch.

BUT I would guess your fuel pump driver module is about to go out. Do a visual inspection, it's above the spare tire mounted on a cross member.