Chrysler Repair: Cruise Control, jumper wire, ground pins

Question
I have 1999 Ply. mini van with 148,000 miles.  The cruise control will not hold its speed any more.  It just gradually looses speed.  Any ideas?? Any help would be appreciated!!!  Thanks,  Rodger  

Answer
Try this test I found

Turn ignition switch to the ON position without starting engine. Activate speed control ON switch.
Disconnect the four-way electrical connector and the vacuum harness at the servo Servo Harness Connector
Connect a jumper wire from Pin 3 of the servo to Pin 3 of the wire connector.
Ground Pins 2 and 4 in the servo. Do not connect pin 1.
Connect a hand held vacuum pump to the vacuum nipple and apply 10 - 15 inches of vacuum.
If servo pulls cable, replace servo.
Ground Pin 1 on servo.
Check that the throttle cable pulls in and holds as long as the vacuum pump is connected. After one minute, check if cable is still holding. If cable does not hold replace the servo.
Disconnect jumper from pin 3. Cable should return to rest position. If not, replace servo.
Connect 4 way electrical connector and vacuum harness to servo