Mis Firing on 1998 Acura TL

When ever it rains my Acura won't run bucks and spits like a mad bull, took it to the dealer and they can't locate the source of the problem. Dry weather runs like a scared cat!! Any ideas?

Asked by for the 1998 Acura TL
Move away from Dripping Springs! Just Kidding.
I would check the ignition system, does it have ignition wires, cap and rotor? If so, these need to be checked.
Is it setting and diagnostic trouble codes?