Problems with Montero Sport 3.0 SOHC Year 2000.

I need them to help me with my Montero Sport 3.0 2000 problem. After 1 or 2 minutes on the rapid accelerating it, it makes detonations as if it were synchronized but I already revived the time and it is fine; Also when putting the scanner I record the p0170 fuel trim code. And emissions feel very strong in the escape.
Please help me soon urgently

Eye that the detonations for the escape, occur because the fuel is burned in the escape and not in the camera, this can be due to a bad tuning, by burned or folded valves, by teaching module, open injectors, pump with a dema pressure, and other Czech factors that the spark plug wires and coils and spark plugs are in good condition.