I have 85 jeep Cherokee 2.5L carburetor manu 4 speed 4x4 ...... when Im driving entire car starts to jerk like its killing the engine. First I thought it was something with the engine, but when I apply presure on the clutch petal, engine works fine, so I think it could be clutch sticking, or something with the push bearring. Its hard to shift only in second gear, im not sure if its the slave cylinder, because if it was it would do it im all gears. Does anyone have any advice? Thank you for any help.