torque converter issues
98 grand prix gtp. 120k miles. i notice at steady highway speed the rpm will jump up 300revs or so and than go back down. converter locking/unlocking? does not do it all the time. tech said converter and not tcc. have not scanned it yet. would you notice any converter issues around town at say lower speeds? 30-40mph max? or is this a highway issue? only had car for 3-4 months. seems to shift fine otherwise. i have been fixing lots of little things, coolant leaks, suspension bits and pieces. i guess any new used car is a learning process.