ok i had a new customer come i today with his ls .i did a quick road test with him and had him come back next week cause i have 4 6.0 diesels in my shop.the problem he is havin with his 05 v8 ls is that when going down a ruff road the inst. cluster beeps and goes dead and the radio shuts off and feels like it dies ,this happens for only a second.then everything is fine.no codes stored in any of the modules.ran a search with no luck.anyone with a idea to whats happening.ill be checkin it next week just thought id see if there were any ideas.thanks in advance.