What was the carb designed for ( the new one you put on)? Why not clean the existing carb which you know is jetted properly? Not likely an electrical problem. Typically an electrical problem is all or none. Not always the case but ysually. The other way to tell is give it a little shot of catb cleaner as someone else oedals the gas. If it takes...then you have fuel issue. If it kills it quicker than could have a too-much-fuel issue.
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