First I want to say I love this website. It has helped me with just about anything dealing with my 97 OBS 4x4 E4OD 4:11,6 position chip[99% time in stock mode] I was towing my small boat[1500 lbs] in overdrive at 60 in cruise 2000 rpms. I was approaching a 50mph zone and hit the brake to kick the cruise off. After leaving the 50mph I hit the throttle to go back up to 60 mph[TC still locked up cruise off] then I steadied the throttle and the rpms jumped up to 2300-2400. so I stepped on the throttle a little and the rpms went down to 2000rpms, let off and steadied it and then back up to 2400rpm. It did this like 3 times in a half a mile stretch then the TC locked up and stayed locked up like normal. Fluid,and tranny temp were all good. Hopefully just a hickup[I doubt it]. I also want to say I had the lights on[as I know the stop light bulbs can affect this?] I will continue to monitor it but just looking at what could cause this. TC,Chip,Brake lights,??