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Old 03-14-2015, 10:44 AM   #12
69chevy lwb
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Join Date: Mar 2012
Location: Evanston
Posts: 304
Re: Help diagnosing a rough running 292

My vote is plugs. Mine was burning oil and fouled the plugs. I put a new ignition system in it as I knew it was the issue but I didn't think to check the plugs. It turned into a very expensive plug change. Back firing through the carb is usually timing related or due to lean conditions. The plugs will also tell you this.
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