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I have a 2007 acadia and I keep having intermittent problems with the injectors on cylinders 2(p0202) 4(p0204) and 6(p0206) with the p0300 random misfire code it will go a while with no issues but will run horribly for days then go back to running just fine I've checked for short circuits in the harness and found none and the injectors are working just fine. the voltage will drop and the traction control will shut off 30 seconds to a minute before it starts acting up I've taken it to two shops and they had no ideas on what it was. has anyone had this issue before or any ideas on what might be? Any help will be greatly appreciated
 

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Have you checked for an open circuit in the 'even' injector wiring when this occurs? Problem could be an intermittent break in the connection between the fuse box and ECM/PCM.
 

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On an '07, I would be checking for a corroded or loose connection. If those all look good it may be a failing ECM.
 
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