Shakes at 30 miles an hour then shakes when only gas is pressed

Hi, this is Bo, an auto expert on RepairPal's Car Genius team! Your Expedition’s got the shakes, and not the good kind from a drive-thru. Since it happens under acceleration and at a specific speed, this could be an **engine misfire, bad motor mounts, or a drivetrain issue**. Start with the basics—check for trouble codes. A misfire (bad coil, spark plug, or injector) would explain the rough idle and shaking under load. If the engine runs fine but the truck still shakes, inspect the **driveshaft, U-joints, and suspension components**. A failing U-joint or worn-out mount can cause vibrations that only show up when power is applied. If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554.