What does the computer tell you? It is surely throwing codes…read them and follow the breadcrumbs. There should really be nothing mysterious here as you are surely using the engine harness and computer that is supposed to run the new engine. Definitely do NOT go to carburetors…that would be a terrible step backward. If you have fly by wire throttle then you should run through the relearn procedure just for fun. If you did the swap correctly this engine shouldn’t even know its in another vehicle. Pull the codes, you definitely have some.
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