Muffler Explosion

WARNING: This page is about a different car, the 1994 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

Ensure ignition timing is correct.
Check fuel-cut system.
Check cold start injector system (if equipped).
Ensure fuel injectors and fuel pressure regulator operate correctly.
Check coolant temperature sensor and wiring.
Check airflow meter or vacuum sensor and wiring.
Check Throttle Position Sensor (TPS) and wiring.
Check air temperature sensor and wiring.
Check oxygen sensor and wiring.
Check Electronic Control Module (ECM) and wiring.