- Faulty Ignition Switch: A faulty ignition switch can intermittently cut power to the engine, causing it to stall while driving or preventing it from starting.
- Fuel System Issues: Despite replacing the fuel pump, there might still be issues within the fuel system, such as a clogged fuel filter or faulty fuel pressure regulator.
- Electrical Issues: Loose or damaged electrical connections, faulty relays, or wiring issues can cause intermittent power loss and stalling.
- Camshaft Position Sensor: A malfunctioning camshaft position sensor can provide incorrect timing information to the engine's computer, leading to intermittent stalling.
- Crankshaft Position Sensor: A faulty crankshaft position sensor can also disrupt the engine's timing and cause intermittent stalling.
- Mass Air Flow Sensor: A malfunctioning mass air flow sensor can provide incorrect air intake readings to the engine's computer, affecting the air-fuel mixture and potentially causing stalling.
Since you mentioned no codes are present, this could indicate that the issue may not be related to the emission control system (including the ERG valve). However, it's still advisable to have the vehicle inspected by a qualified mechanic to accurately identify and fix the root cause of the problem.
