The governor valve is stuck.

Clean or replace the governor screen and/or the governor.

The valve spring of the vacuum modulator is not properly adjusted, or the vacuum hose is kinked or leaking.

Check the spring adjustment.

The mechanical actuator cable is kinked, broken, or not properly adjusted.

Replace, adjust, or repair the cable.

The mechanical actuator is obstructed.

1. Check the actuator.
2. Replace the actuator if necessary.

The modulator is inoperative.

Replace the modulator. Refer to Transmission Modulator Replacement .

The trimmer valve is sticking, or has a broken spring.

Replace or rebuild the control valve body assembly.

The control valve is sticking.

Replace or rebuild the control valve body assembly.

The modulator valve is sticking.

1. Clean the valve.
2. Check the vacuum modulator.
3. Adjust the spring.

The engine idle speed in neutral to drive is too fast.

Adjust the engine idle screw. Refer to Idle Speed Adjustment in Engine Controls.

The selector linkage is out of adjustment.

Adjust the shift cable. Refer to Shift Cable Adjustment .