Re: loping engine?
Changing the manifold was likely what affected things. This requires removal a fair chunk of the fuel system. A person stands a chance of several manifold pressure or fuel delivery discrepancies happening during that process. If the old manifold had some leakage before then the carburetor would have to be readjusted to compensate. If the current manifold has a leak then that is a problem. The engine will run lean which can cause hickups if the mixture can't not be compensated for by idle speed or mixture adjustments. Removing a carb can move the float around inside there and any crud that might be movable too. Disconnecting the choke control and associated mixture adjustment there could cause changes to that adjustment as well.
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