Typical causes of driveability degradation are rough idling, misfiring, surging, hesitation, or insufficient power. Problems encountered included misfiring magnetos and breaking primary chains. Although Costantini had dominated the race, his engine started badly misfiring. Ataxia, the most common symptom, is due to misfiring of Purkinje cells in the cerebellum. This misfiring may result from impaired inhibitory mechanisms during muscle contraction. Berger suffered from a misfiring engine throughout the race. A Confederate soldier bled to death having been wounded by a misfiring cannon. Lauda soon dropped down the order with a misfiring engine and soon retired. Two Hyunmoo-4 missiles were test-fired in April 2020, with one of them misfiring. The No. 33 Barazi-Epsilon Zytek led LMP2, after an earlier misfiring problem had been repaired. In the fourth hour, Gregory brought the NART Ferrari into the pits misfiring. This result in misfiring and the need for accurate speed control. He asked John Kaweesi to warm up in place of the misfiring Majid Musisi. Stewart remained the race leader until his car began misfiring on lap 27. Historians believe the humid weather contributed to the double misfiring.