1. Immediate Actions (While the Engine is Running):
* Turn off the ignition: This is your priority. If you can safely do so, turn the key to the "off" position. If the engine won't turn off, proceed to the next steps *immediately*.
* Shift to neutral (if safe): If the car is moving, try shifting to neutral. This might help slow the vehicle, but only do this if it's safe and you have control of the vehicle.
* Pull over immediately and safely: Find a safe place to stop, far from traffic.
2. Troubleshooting (After the engine is off):
* Cable vs. Electronic Throttle: The 2000 Grand Prix GT likely has a cable-operated throttle. However, some models might have an electronic throttle control (ETC) system. Identifying the type will guide your next steps. Look under the hood; a visible cable connecting the gas pedal to the throttle body indicates a cable system.
A. Cable-Operated Throttle (Most Likely):
* Inspect the cable: Carefully examine the throttle cable for kinks, binding, or anything obstructing its movement. Try gently moving the cable back and forth – it should move freely.
* Check for debris: Look for debris (leaves, pebbles, etc.) that might be interfering with the cable or throttle body.
* Lubricate (with caution): If the cable is stiff, you can try applying a small amount of silicone-based lubricant to the cable where it moves. Do not use WD-40 or other petroleum-based lubricants; they can attract dirt and damage the cable.
* Throttle Body: Inspect the throttle body itself. Sometimes, the throttle plate can stick due to carbon buildup or other deposits. A thorough cleaning might be necessary. (See below for more on cleaning the throttle body).
* Return spring: The throttle cable should have a return spring. Make sure this spring is intact and functioning correctly; a broken spring will prevent the throttle from closing completely.
B. Electronic Throttle Control (ETC) System (Less Likely but Possible):
* Do not attempt to manually adjust anything: ETC systems are complex. Trying to fix them yourself could cause further damage or even create a safety hazard.
* Professional Help is Crucial: If you suspect an ETC issue, take your vehicle to a qualified mechanic immediately. Problems with the ETC system often require specialized diagnostic tools and repairs.
3. Cleaning the Throttle Body (If cable is free but throttle still sticks):
* Disconnect the battery: This is crucial to prevent accidental electrical shorts.
* Remove the air intake: Access to the throttle body will require removing the air intake tube.
* Clean the throttle body: Use a throttle body cleaner (available at auto parts stores) to remove carbon buildup and other deposits. Follow the cleaner's instructions carefully. Use a soft brush to gently scrub away stubborn deposits.
* Inspect the throttle plate: Make sure the throttle plate moves freely.
* Reassemble: After cleaning, reassemble everything carefully.
* Reconnect the battery:
4. When to Call a Professional:
* If the problem persists: After trying these steps, if the throttle is still stuck, you need professional help.
* If you're uncomfortable: If you're not comfortable working on your car, don't attempt any repairs yourself.
* For ETC systems: Always consult a mechanic for ETC system issues.
Safety Note: A stuck throttle is a dangerous situation. Prioritize your safety and the safety of others. If you are unsure about any of these steps, seek professional help immediately. Don't risk driving the car until the problem is fixed.
