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noise
radio noise when the engine is running is generally caused by "backfeeding" by the alternator, or a bad spark plug wire, that's no longer "supressing" the spark.
the alternator has a condensor on it, to prevent this. you may have a problem with your alternator/regulator.
check your plug wires .... if they're bad (or just one) it can cause this. by putting your truck on an ignition scope, you'll see a bad plug wire right away..... especially since you say it does it intermitantly, especially when humid or raining. this is when a bad plug wire is the most obvious.........
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I haven't, nor ever will claim to know everything about cars..... but a big f*cking hammer can fix most problems.....
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