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It could be pretty much anything
check the TPS sensor, MAP sensor, O2 sensor, check for any vacuum leaks.
I've had the same problem since I've had my engine swap, and I still can't figure out what it is. I think it's the TPS sensor. You can't just get a new sensor, you have to get the whole throttle body replaced. My engine came with a broken TPS sensor, so I got a used throttle body. A new one would have cost me around $700. But then again, it could be your fuel injectors, or the fuel filter. Try running some fuel injector cleaner through the fuel system.
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