I know it has been many years since you asked about this problem. But if by chance you still have the same email as back then, what did you find out to be the actual problem? I have the exact three symptoms and have been struggling with this for a while. The loss of 5 mph was caused by a vacuum leak under battery tray. But the lack of resume and Set + acceleration functionality still plagues me. Even after I substituted out the control module. Only speed signal comes to mind, because sometimes it sets fine, but then the resume and Set + will then follow and not work.
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