Sometimes when I'm driving the engine stops excelleration, almost as if the car has a governor on the engine. The tackometer goes from 22,000 down to 7,000 rpms. The engine does not shut off but when you push the excellerator nothing happens.
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if it is a petrol engine then the governor arm will hold the carby open when stopped
as the engine starts the governor moves the arm to close the carby off to idle. the speed setting is by a spring attached to the throttle level and a point on the governor lever
If you mean a 100 mph, then that is perfectly normal. They are making engines with governors inside so a person cant try to outrun the police. Mine will get up to 100 and lose all engine power till the speed drops back down to 97. Then the engine kicks back in again.
Not understanding you 3 wheel drive thing, But I believe that the Xterra are a front wheel drive based engine and if that is the case most front wheel drives will pull to right at excelleration and then to left under letting of excellerator. This is do to engine torque but if it is extensive you may want to check motor mounts.
sometimes loss of power can be caused by a clogged catalytic converter which can make the car at times hesitate, and about the trasmission maybe the governor on it might be faulty what that does it changes the gears when it reaches certain speed