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Question for someone who might have an answer. Recently swapped the k24z7 motor with a z3. Got everything done and it starts right up and runs great for about 5 to 10 minutes. Then when I rev it up to around 5,000 rpm while driving it sputters terrible and sounds like a freaking Subaru lol. Turn the car off for a bit and does fine until I rev it again. Mods.3 inch Ktuned down pipeand 3 inch catback exhaust. Throttle body spacer. And currently on Just a base map tune with these mods on flashpro. Any help appreciated. Thanks
 

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If you are positive everything is mechanically sound, then I would say it's the tune.

Are you sure the cam timing is correct? Any CEL?

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