misfire on #2 cyl. sometime run smooth then skips on 2008 Ford Explorer

i have changed coil pack, plugs, plug wires, is not losing water no bubbles in radiator....

Asked by for the 2008 Ford Explorer
Going along with goodguy and that guy wetry, if plugs are OEM , and it's SPECIFICALLY a #2 misfire only , then if plug is not misfiring due to oil fouling , you maybe could try swapping injector to a different cylinder to confirm that it's the injector , not an internal problem? wetry might call me an idiot , but thats only because I like green jelly....................Don't underestimate the power of a plug to give you good info. on the problems cause!
1 more answer , 2 more comments
could have a vacuum leak check compression
Agree with Goodguy, also may have an injector problem.
good call wetry never thought about that