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YOU HAVE BOOST LEAKS
People are so quick to jump to the tuner as the issue. Your car was running fine, blew a coupler, you put the coupler back on and think its tight but its not. Hook it up and put 25psi in there and it becomes apparent where your problem is. Been through this 100 times. Use soap and water in a spray bottle preferably when the car is cold.
Car is sitting at idle air is entering the system through the leak = lean afr
Under boost air is EXITING the system = Rich
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