2001 F-150 Skipping

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I have a 2001 F150 SuperCrew that is skipping periodically when the engine is put under a slight strain. The engine light will not come on to tell me what the problem is. I had it in the garage and had the transmission serviced, fuel filter changed, etc but they told me they couldn't determine the problem until the engine light came on. I have also changed 6 of the 8 spark plugs (the last two on the back of the driver's side are nearly impossible to get to). The plugs I replaced look okay. Of course this engine doesn't have plug wires so changing them isn't an option. Note: Engine is the short block V8. I'm at wits end...someone please help!

[way2old]

Replace the other 2 plugs. Also look closely at the coil boots to see if there is any sign of arcing, usually a small white spot. Or to see if the bottom of any boots are cracked.

[jeffroski]

Make sure to change those plugs cold, otherwise you'll possibly have one blow out. the first sign is an exhaust leak sound, such as a mild ticking. Number four was the one that let loose on me, only a $1500 repair job.