Help me diagnose this engine "gasp" (video included)

[TNBuggy]

Anyone know what causes this hiccup when the engine is at idle? Doesn't do it too often, but I have no idea what it means. Almost sounds like the engine completely dies for a split second and then fires back up. It actually doesn't sound as bad in the video compared to hearing it in person. It happens twice in this video at about 15 seconds in and again at 20 seconds. Thanks Here is the video:

[BuggyMaster]

Ya, that's a dead fire. Check your plug lately? Could be a lot of things but it is an engine and I don't think I'd worry about it.

[rich1]

Ignition miss-fire ,1St try a new plug.The best way to find it is to use a spark gauge . The gauge lets you watch the spark ,measure the voltage, and rule out plug failure.

[TNBuggy]

Thanks for the help. I am going to pick up a new plug (NGK C7HSA or the CR7HIX) tomorrow. The CR7HIX is the iridium version and is a little more $$$. I have never changed out a plug... anything I should know?