We just bought a 99 4x4 and it misses randomly and the cel comes on when it does miss, this only happens when its wet outside. No problems when its dry, but unfortunately that hasn't been much around arkansas this year.
I'm planning on checking the cps plug in and the air filter box.
there is a write up on this sight that suggests rough running may come from your idm getting wet inside. usually most common in e-series vans due to the placement of the idm. but it never hurts to check. locate your idm and remove it, and shake it around to see if you cant hear any sloshing around from water being in it. good luck
Mine did the exact same thing, got the CPS replaced under warranty and it hasn't done it since...
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