Speed Control Accelerates or Taps Up By Itself

Check for diagnostic trouble codes. If code 15 refer to Computers and Control Systems/Testing and Inspection/Diagnostic Charts, if code 34 perform the following test:
1. Conduct the speed control switch test on the RESUME/ACCEL switch.
2. If it fails, replace switch.
3. If it passes, disconnect the 4 way connector at servo. Test continuity of pin 1 to ground to test for intermittent short. Wiggle wires while performing test.
4. If continuity to ground, repair wiring.
5. If no continuity to ground, replace PCM.