What Causes Normal Restart After Engine Stalls While Driving?

[OAthena]

Normal restart after engine stalls while driving can be caused by the following reasons: 1. Vacuum leak in the intake manifold; unstable idle due to improper idle adjustment, dirty throttle body, or malfunctioning idle control system. 2. Unstable fuel pressure: such as excessive wear or poor contact of the electric fuel pump brush, clogged fuel pump filter, blocked or leaking EGR valve; malfunctioning fuel pump relay, EFI relay, or ignition relay; poor contact in the fuel pump drive circuit or fuel injector drive circuit. 3. Poor ignition system performance: such as weak high-voltage spark, excessively worn spark plugs, incorrect ignition timing, poor contact in the ignition coil or inter-turn short circuit when hot leading to no or weak high-voltage spark, poor contact in low-voltage circuits, damaged insulation causing intermittent grounding, or poor grounding.