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Body control module prevents roll starting engine (manual shift trans ) on GM vehicles 1998 and newer. Once running you can kill engine by shutting off fuel pump with key switch on. (pull out fuel pump relay is one technique) Reactivate fuel pump and it will roll start but the key switch has to remain on otherwise security light comes on. On my 1998 Eldorado security light comes on once in awhile and I have to wait 20 min. before I can attempt to restart it. Frustrating.
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