hello all- i washed my engine with garden hose not high pressure and now i have a bad skip. i would assume its a coil pack that got wet, theres no check engine light yet. any ideas? also how do i determine which pack it is if thats the problem? its a 01 supercrew with a 4.6. thanks

 

The coil packs on my 1999 5.4L engine have connectors that disconnect rather quickly by squeezing the connector and pulling on it.

I pull my connectors one by one while the engine is idleing and see if it makes it idle worse. If I pull a connector and the engine does not idle worse then I suspect water in that spark plug hole.
I then remove the coil pack and blow the water out of the spark plug hose with an air hose.

I usually wash my engine when its cold so that the cold water does not cause something to crack because of the difference in temperature between hot engine parts and cold water.