I have a 1996 Ford Ranger with a 3 liter v6 and standard 5 speed transmission. It has been driven very little over the last two yearsbecause of illness and has less than 21K miles. There is an intermittent problem with the clutch where after about one hour of driving the clutch cannot be pushed to the floor. The truck will not move while this problem is present. It is possible to shift through all gears without depressing the clutch which leads me to believe that the clutch has not been released from its engaged position. After about two to three hours, the clutch then works fine and the truck can be driven again. In every case the truck was parked and left for a period of days. Ford replaced the sensor that rides on the plastic rod attached to the clutch pedal and this did not solve the problem. I would appreciate any information as to what the correct resolution could be.