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A 1998 Altima may stall at 2500 rpm's over a bad spark plug or plug wires.
It is black.
Yes
If you mean that the wire came out of the boot, then pull the boot off of the spark plug and use a spark plug socket to remove the spark plug.
If you have a loose spark plug, your car will not stall unless maybe your engine has 3 cylinders. If you have a 6 or 8 cylinder engine you would just loose some power and your engine would run a little rough.
Spark plug wire not connected to spark plug? Spark plug wire connected to Wrong spark plug? Vacuum line disconnected? Bad spark plug or wire?
It probably needs a new set of spark plug wires.
Several things can cause your car to stall and shake when you stop. Replacing the spark plugs and spark plug wires may cure the problem.
If the spark plug end (combustion chamber end) is coated with dry, black soot, it indicates weak spark or incomplete combustion. Note that this doesn't necessarily mean that the plug is bad; weak spark more often indicates a faulty coil or plug wire or, sometimes, an overfuelled cylinder.
A rich condition. Either too much fuel or an incomplete burn.
Probably losing spark in that one cylinder, maybe a faulty spark plug, a spark plug wire or distributor cap.
A bad spark plug or spark plug wire will cause your car to run rough. A dirty air filter will also cause your car to run rough.