I have a 1897 mustang gt 4.6 automatic when I got it ran fine all day next morning was hard to start had to cycle the key a few times after started ran fine did the same thing for a few days ran good after it started all day jus hard to start after setting allnite checked to see if it was getting good fuel it wasn't so I changed the fuel pump fuel filter started surging idling up an down between 500 an 100 rmps fall flat on its face at about 3000 hooked back up to dieing ostic tester said MAF tso unhooked MAF cleaned filter an sensor good surging problem stopped ran perfect all day also changed plugs an wires an temp sensor but after shutting off nest morning still wouldn't start unplugged MAF didn't help held down the throttle half all the way nothe eventually like always started an stuttered a few times came to life running perfect jus messes up an don't start after setting all night anybody have any ideas please let me kno

 

This isn't a tech section, but I commend you on your fantastic post.

 

1897? That's one rare Mustang!