Hope this isn't too vague...but here goes. My 1989 Maxima automatic(155K miles) started intermittently loosing power while driving. When this happens, it only happens for 1-2 seconds then power comes back, it doesn't respond to my accelerator at all when it looses power. At cruising speeds (65-75 mph) it doesn't stall, but it does sometimes stall if I'm just pulling out of my driveway. This doesn't happen when I use it in the morning only after it warms up a little. There is no check engine lite illuminated. The car runs normal when this doesn't happen. I've done the following so far:
1)Replaced plugs and wires
2)Replaced rotor and cap
3)PCV valve
4)Fuel and Air filters
5)Fuel injector cleaner and moisture elliminator added to fuel

Anybody have any ideas??? I need some help!

Thanks,
Izzrock

 

Mass Air Flow Sensor?

 

Maybe the cat converter

 

Sounds like a failing Oxygen Sensor.
Lookup ngksparkplugs.com.