i have a 95 maxima se. just replaced the MAF and battery and cleaned the spark plugs. MIL codes P1320 (distributor interrupt signal, because i have an aftermarket replacement coil, did not affect performance in the past) and P0325 (KS). Both codes have been present for over a year with no performance issues.. i cleared the MIL to see if the light would come back on.. It did after a few restarts. Freeze frame data showed both fuel systems in OL-Fault and STFT at 0%. Cleared the MIL again, rechecked for codes, then the fuel systems showed CL and STFT at 25%. at idle, it will idle smoothly at around 700-800 rpm, then momentarily drop to around 500 rpm.. when it drops, the engine runs quite rough, almost to the point of stalling, then it "recovers" and the idle levels out at 700 again.. that pattern repeats every 30-40 seconds.. while driving, i noticed that the car hesitates as it climbs to 3000 rpm under moderate (1/2) throttle, but if i floor it, as soon as the tach passes 4000 rpm, the car surges.. just changed the fuel filter last year along with the #2 fuel injector. only mods are a short ram intake and glass pack muffler.. i'm thinking o2 sensors???

Welcome to NICO! Hopefully we can get your problem resolved. I moved this to the Maxima forum where it should be spotted by the right folks.

I'd suspect your EGR valve. Try cleaning it. It's a common issue on these cars and your symptoms are pretty typical.