What would cause a 1995 Nissan Maxima to run and idle rough at times, and then run perfectly normal? Is this a problem with the injectors, spark plugs, plug wires, or what could it be? The check engine light does not come on, so this seems to be minor, yet annoying problem that needs to be corrected. The car is in perfect condition and is garaged and well cared for. I look forward to hearing from you. Greg Porter

you would need to do an injector balance test with a scan tool to see how the injector reacts to the test. rough idle my be caused from a number of issues including bad motor mounts, bad gas, incorrect spark plugs, or incorrect spark plug gap, bad idle air control valve, air in cooling sys, etc....

It sounds like you have a bad coil, a bad injector, or a dead cylinder. Any way you look at it it sounds like you are not hitting on all cylinders. You may want to check and see if you have spark in all you plug wires. If you have spark that means your coils are working. Next I would check the injectors with an olm meter. I think those injectors should olm at around 12.9 olm. much higher or lower they are probably bad. If that is all good I would find a compression gauge and check all of the cylinder's compression. The compression needs to be at least 100 psi in order to fire that cylinder properly. I hope this helps you out and gives you some ideas as to where to start looking.

check your MAF sensor first..thats what it was on my 4th generation Maxima after tearing down the whole tbi system and what not....just pull out the sensor itself and clean it up, see if thats it, if not....idle control valve probably. or wiring.

How about the fuel pressure regulator allowing too much pressure to build, or the fuel injectors themselves leaking?

try running a few pints of injector cleaner through the system

check your EGR and for vacuum leaks

check injectors , mass air folw meter,

look at your crank sensor,,i think its faulthy.

TRY cleaning your throttle plate. these get some carbon buildup and will restrict airflow at idle and can cause the computer to try and compensate for it

check fuel filter then check the ignition system