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Hello ok so I bought a 2002 mr2 and it came with a parts car so I decided to swap the transmission to a full manual due to the smt not working properly. Car runs and drives but is idling at 2,100 rpm and I’m having to hold peddle down a little till it warms up before it will idle on it’s own also if I turn the ac on or fall below the 2,100 rpm the car shuts down. I am using the original ecm wondering if that’s my problem and how to fix any information would be greatly appreciated thanks
 

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You would need to tell us exactly what you did to the car before we could help you. I don't think that the SMT ECU will run at all unless it can connect with the SMT controller.
 
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