while driving my 88 xj the tranny will act almost like its shifting in and out of overdrive a jerking sensation and the rpms rise and fall about 200 rpms. the reason i feel its not acually shifting is because if i manually shift from d to 3 is the rpm difference between d and 3 is more like 500 to 600 rpms. so could it be slipping? like i said its more like jerking not a steady rise in rpm like a slipping tranny would maybe a stuck solinoid in the valve body!