What is the cause of the engine light on and I've test says a misfire?

What is your question?

Misfire changed the oxygen sensors, plugs and wires, alternator, battery , coil packs and still get the same code and it lags when accelerating and hear a clicking noise on acceleration?

What makes this problem better or worse?

Nothing

How long has your 2002 Mitsubishi Montero Sport had this problem?

Month