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What I'm saying is you can watch that fuel control unit assembly and if it's moving just grab it with your fingers and hold it in one position see if you can get it to idle and stay running not cut out.

You said checking the fuel shut off. I'm going to guess you're talking about the fuel control unit assembly. If that's hanging up in the idle position that could cause surging you might want to double check that again. You can run the engine with the timing shutdown rod cover off and watch to...