What make engine shake on 2nd gear?

Engine shaking in second gear can be caused by several factors, including improper engine mounting, which can lead to excessive vibration during acceleration. Additionally, issues with the transmission, such as worn gears or low fluid levels, may contribute to the shaking. Misfiring cylinders due to spark plug or fuel delivery problems can also cause noticeable vibrations when under load. Lastly, unbalanced wheels or drivetrain components can exacerbate the shaking, especially at certain speeds.