Does it rain heavily where the X is kept? The only thing I can relate to is that when I've driven through heavy rain areas and I get Trans Failsafe codes from the trans computer getting wet, so the truck would act oddly and sometimes do the exact same thing until everything dried out. It happened recently actually when I was driving from Boise to Reno through the rain, came to an abrupt stop off the Reno exit and BAM...TFS code. The next day I had issues even starting the X, but once it finally did, it would do the same thing. I've yet to take apart the ECU box and see how to remedy my problem.

I don't know if you have an Android or iPhone, but I have an Android and use an app called Torque (iPhone has similar apps) then a simple $20 bluetooth OBDII device that I can use to monitor 02 sensors, fuel injector pulsing, ambient air temps, etc...all from my phone.

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