While driving, hit a POTHOLE or similiar, Engine shuts down. Suggestions to FIX?

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While driving, I hit either a Pothole or where the 2 pieces of pavement are "joined" together but with a rather HARD HIT when going over . The "normal" joints on highway are no problem. My engine shuts off and I place trans in netural, turn key off, then back on & restart engine; unless Battery is bad & will not start without a jump. I've wiggled battery, fuse box ( under hood), which i've noticed DOES slide somewhat up/down & forward/backward on a "rail type" of holder. IT does not actually come "up". I ALSO have a loose R. F Wheel sensor to the ABS. Not sure IF this would cause the problem. DID not have problem until dealership change the ECM at about 40,000 miles due to leak in windshield ( covered under warranty). I do not know as to WHERE the ECM is located or HOW to get it out to check. Suggestions Thank YOu