A friend of mine has 98 automatic civic, Problem he is facing is the vibration and
rpm fluctuation after or just before gear shift in low rpm.
When a throttle is given everything becomes normal, but yet appears if the rpm is stationary
while cruising and the car is about to change the gear.
I personally think its a liner solenoid valve as the shift lock solenoid valve found on top of gear
seems to be ok and car is switching gear.