i have a 93 maxima (automatic) and everytime i drive it it stalls when im just drifting or stopped. its been running really ruff and sometimes the rps will go crazy when im in the middle of accelerating i just replaced the spark plugs myself but it has been doing it before i replaced them, can someone help? whats wrong? can i fix it myself or inexpensivly?

check your battery cables and terminals.

You didn't mention if you also changed the sparkplug wires, rotor, and distributor cap. Another thing to check is that you have the correct gap on your spark plugs. Other options are to check your fuel line (pump, filter, sender). Also, dependign on your milage, it could be time to check your timing chain/belt.

Have you checked you fuel filter. If it is full of junk when you are pushing on the gas there might not be enough getting to the motor. which would cause stalling