Cracked distributor cap, maybe? If you can't see anything, you could still check by wetting it down (using a spray bottle) in dry weather and see if the problem appears. You can also try the same on other parts of the ignition system, one at a time, until you isolate the problem component.
Ursus - 2009 Ford Ranger FX4
BedRug, BakFlip HD, Pop&Lock PL8200 tailgate lock, Sportz tent
Last edited by prestidigitizer; 02-12-2010 at 07:12 AM.