Section 58 (Engine Controls - Tests W/O Codes - Gasoline): Symptoms: Backfiring

WARNING: This page is about a different car, the 1995 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Ensure ignition timing is correct.
Ensure timing belt/chain has not jumped.
Check distributor (if applicable).
Ensure fuel injectors are not leaking.
Check spark plugs.
Check ignition and coil circuit.
Check crankshaft position sensor.
Check MAP sensor.
Check TP sensor and connector.
Check exhaust system.