as of yesterday my 5.4 lightning, has had me stumped.
all yesterday morning it was wet out, at about 5, 6 pm, it started to get dry out and also a rough idle appeared and when i hit the gas from a stop or under load, (e.g. a 45 roll and trying to accel.)the engine will just shake the truck and have no power. pulled all the coil packs looked for water in the plug holes and physical damage on any of the coil packs, none. also metered all the contacts on the packs, all reading came back the same. metered all the injectors, all have a short. it is not as bad today, idle is smoother but still no power and shakes under load.

anyone have anything else i can test, or it goes to the dealer on tuesday

also no service engine light came on, at all..

thanks
jim