2001 Chevy Suburban shuts off hitting minor bumps

This problem has been driving me nuts. My 2001 Chevy Suburban shuts off fairly regularly when going over rougher roads at speeds more than 20 mph. I have changed the igniting wiring harness only, the crankshaft position sensor and just last week, the fuel pump. The problem still exists. I am at wits end. Any suggestions? Thanks
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