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Changing the ECU is not a simple task. A dealer level bi directional scan tool is usually required to match it to the car's other systems. I doubt the problem is a bad ECU. Unfortunately the diagnostic skills and equipment required to trouble shoot your problem further may be beyond the scope of this forum. Perhaps you can find a mobile mechanic with the necessary abilites but I think that is going to be tough.
 

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2016 Malibu 1LT 1.5T/6-speed 6T40
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I think some of the older 2.2 had a separate ignition module but around 2006 or 2007 it was integrated into the ECM like @Drunken Elvis wrote.
 
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