03 Ranger 3.0 idle missfire-help!

[slsnut]

I only get this miss at idle. Truck runs well otherwise. I replaced plugs and wires (they were the originals) and did not correct miss. Cannot hear vacuum leak but I am assuming that is my problem. Any ideas from the brain trust? :scratch:
steve

 

[Tbars4]

...Have you checked for stored codes???This can help diagnose the exact area causing the problem and even tell you what cylinder is missing...