try swapping the plug with one from another cylnder if the miss is still #5 try swapping the plug wire with another. you can also check the coil pack by pulling the wire off the plug and install an old plug and rest it on the exhaust manifold start the truck and look to see if it is firing.

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92 Ranger XLT
Fordstrokers 347 TFS 205 cnc track heat heads
Parker Funnel Web intake, Pro-system 780 carb, full MSD ignition, headman headers
TCI 3500 stall converter, AOD built (inhouse) with TCI kit, 8.8 out of 04 Ranger
(inhouse)=in the house on the kitchen table
http://www.youtube.com/watch?v=DhuJE04Up8Q