When it misses, is the engine wet with dew & does the CEL blink???
If so, have the computer scanned for trouble codes & post All code numbers here. Most autoparts stores will scan the computer at no cost if the CEL is lit, or your having problems.

If no CEL or codes, with the engine at cold idle, maybe try raising the hood at night & have a look around for arcing & sparking on the coil packs, plug wires & plugs at the trouble rpm.
If no joy, try a wet down test of each plug wire & coilpack, using a spray bottle of water & see if you can induce a miss, or see some arcing & sparking.

More thoughts for consideration, let us know what you find.