[LTDzak]

Mark, based on my own recent tough luck experience on my 99 3.8L Windstar w 160 K, next time you get the slight miss pull it over right way and check for codes. If you get any of the P030X where X is the number of the cylinder, pull the plug to investigate. If the plug is spotlessly clean, as it was in my case, then you have coolant leaking past the intake manifold lower gasket and into the intake tract. When it gets worse you can end up hydrolocking the engine and bending a rod like I did.

Mine set a code for the cylinder that was eventually found to be a culprit, but the code would erase itself once the engine warmed up and the misfiring would stop.