If this only happens when it's damp out, chances are your spark plug wires are arcing. When was the last time they were replaced? If they're factory wires, they'll be marked with the year they were made on the wires. Usually these won't last more than 10 years or 100,000 miles.
If they're in question, change the plug wires, spark plugs, distributor cap and rotor.
Testimonial: "I talked to a LEXUS LX 450 owner - he had had the same problem and the repair he had had done was exactly what you recommend. Thanks"
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