Bad connection:
- Double-check that all the connections to the ignition are secure. A loose or disconnected wire can prevent the ignition from working correctly.
Faulty ignition module:
- The new ignition module could be defective. Try re-installing the old ignition module to see if the problem persists. If the vehicle runs fine with the old ignition module, the new one may be faulty and might need replacing.
Incorrect timing:
- Ensure that the ignition timing is set correctly. Incorrect timing can cause the engine to run roughly or stall. It should be matched accurately as recommended in your vehicle manual.
Fuel/Air mixture:
- The new ignition setup might require adjustments to fuel delivery or air/fuel mixture. Incorrect fuel/air mixtures can cause various engine issues, including stalling.
Malfunctioning Sensors:
- Sensors involved in engine management (like O2 sensors, coolant temperature, crank or camshaft sensor) provide vital data for the ignition system. If any of those sensors are not working correctly, it might affect the ignition system's operation, leading to stalling.
If you are unsure about diagnosing or fixing the issue independently, I would advise you to take your vehicle to a qualified mechanic.
