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Your 92 gmc makes a sound like an old speedometer cable would but when you took the instrument cluster off there was no what else it be only noise pushing on gas sometimes when?

Possible causes for the noise you're experiencing in your 1992 GMC:

1. Vacuum Leak: A vacuum leak can cause a whistling or hissing noise that is similar to the sound of an old speedometer cable. Check for any loose or disconnected vacuum lines under the hood.

2. Power Steering Pump: A failing power steering pump can make a whining noise, especially when turning the steering wheel. Check the power steering fluid level and condition. If the fluid is low or dirty, it may need to be replaced.

3. Alternator: A faulty alternator can also produce a whining noise. Check the alternator belt for proper tension and inspect the alternator for any damage or loose connections.

4. Fuel Pump: A noisy fuel pump can sometimes be heard from inside the cabin. Check the fuel filter and fuel lines for any obstructions or leaks.

5. Transmission: A transmission issue, such as a worn-out bearing or low fluid level, can also cause a whining or grinding noise. Check the transmission fluid level and condition and have the transmission inspected if necessary.

As the noise you described seems to occur when you press the gas pedal, it's likely related to one of these components that are engaged when you accelerate, such as the engine, transmission, or fuel system. It is recommended to have your vehicle inspected by a qualified mechanic to accurately identify the source of the noise and recommend appropriate repairs.

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