Vehicle Speed Is Unstable

If vehicle speed is unstable, perform the following procedures in order:

• Check actuator cable free play and operation. See CRUISE CONTROL ACTUATOR CABLE  under ADJUSTMENTS.
• Perform VEHICLE SPEED SENSOR CIRCUIT CHECK  under SYSTEM TESTS.
• Perform THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK  under SYSTEM TESTS.
• Replace actuator with known-good unit. See ACTUATOR ASSEMBLY  under REMOVAL & INSTALLATION.