I advise you make a post in the ZR-1 section of corvette mechanic and we will see what the guys over there think about your ABS problem. I am the moderator there and will get ZR-1 Pete and the other mechanics to comment on your problem...In fact just post under C4 tech. ?'s cause this is not a LT5 specific problem but a gereral C4 problem. I bet C4C5 specialist and others have some ideas. Be sure to post a good long description of the problem and when and how it occurs! Here is the link, you will have to register for access to the site.
http://corvettemechanic.com