My old 96 SS ran great and would show a P0300 code every once in a while for no apparent reason. The car would be idling great and suddenly the SES light would start blinking. I never fully solved that problem and the guy who bought the car had it pop up a month or 2 later. The 96's are a little more touchy with the P0300 I think because they were the first year with that crank sensor setup. But it sounds like you have a real issue. The rain makes me think water is getting into something.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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