1. Incorrect ignition timing: If the ignition timing is too advanced, it can cause the engine to fire too early, resulting in a popping sound and flames shooting out of the exhaust.
2. Faulty spark plugs or ignition wires: Worn or damaged spark plugs or ignition wires can cause the spark to be weak or intermittent, leading to misfires and popping sounds.
3. Lean fuel mixture: A lean fuel mixture, which means there is too much air and not enough fuel in the combustion chamber, can cause the engine to run hot and produce popping sounds and flames out of the exhaust.
4. Vacuum leaks: Vacuum leaks can cause the engine to run lean and produce popping sounds and flames out of the exhaust.
5. Cam problems: cam timing problems can cause popping in your exhust
It is important to diagnose the root cause of the problem to ensure proper repair. If you are not comfortable troubleshooting and repairing the issue yourself, it is recommended to consult with a professional mechanic.