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What's with the "buzz' in the B21? 200 1980

My '80 242DL w/B21 & K-jet is running OK albeit with a sort of "buss" when running which I haven't heard in other red OHCs. Maybe this is inherent in B21s but since it's 28 yrs old with only 41K miles I wonder if the injectors are clogged & replacing the would help. This is what my mechanic advises but is there a more economical solution? I've run a few bottles of Techron through it with no change. We don't have an injector tester. Thanks, guys.






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