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A wheel bearing/hub assembly going bad could do that.Also check for scalloped tires.
faulty actuator switch. GM had some problems with these.
A FUALTY SPARK PLUG
My issue was the actuatior had no vacum
Driving in 4WD mode on dry roads can cause that. Also, mismatched tires can do that too.
The year, make and model vehicle would help.
cause you farted on it
Well your 4WD might be going out, it probably wouldn't hurt to get it checked out.
This could be bad spark plugs or plug wires
4wd or 2wd? If 4wd yes but if 2wd no!
do you engage 4WD manually or via the button on the dash? if its the latter then your actuator switch is probably bad. tweek
The transfer case could have been jammed, such as by shifting int 4WD while wheels were slipping. If a pin bends, it can stick the transfer case in 4WD permanently.