Isuzu motor drown

I have an isuzu 4ze1 engine, it works well in low revolutions, but when accelerating it with load the engine is drowned, check with time light and it seems that when time fails it is advanced a lot, change the gasoline pump, check for some empty filtration but no. Let's see if someone has had the same problem and can help me thanks.

If you checked with time light I do not understand to change the pump since that would be power in displacement.

Well the pump changes it before checking with the light, because it weighed that you see pressure but no gas flow.

Ok but if being parked and runs it, you accelerate well comment that it is failing to be walking

I thank you for your attention: the fault also makes it parked if I accelerate it thoroughly, it is at that time that time is ahead and at times the light is lost.