1998 Oldsmobile Silhouette starting in high gear

Lately, the transmission in my van has been starting out in high gear (3rd), and sometimes the ABS and TCS lights come on, and this seems to cause a problem with the transmission as well. Most times, if I shut the engine off and restart it, the transmission will start working correctly, but there are times when I have to shut it off and restart maybe 6 times to get it to start out in the correct gear. When the ABS/TCS lights come on the tranny doesn't go into overdrive. I just had the transmission system flushed, tranny fluid changed, and a new filter put on, but that hasn't seemed to help the problem. Any suggestions?