Hi,
I have a rough idle in my 93 maxima GXE, with 120 K miles on it. the car idles rough only in Drive or Reverse. As soon as I change to Park or Neutral, it becomes smooth again. When in motion, i.e. when the accelerator is pressed even a little bit, the roughness goes away. The rpm when the car is cold is >1000 both in Drive and Neutral. Its not rough then. When its heated up nicely, the Drive idle rpm is 600 and Neutral idle rpm is 700.

I had 2 injectors replaced last August, and the engine does not miss at all. The pickup is what you'd expect from a nissan v-6, albeit slightly on the slower side due to the heavy mileage on the car. I use an injector cleaner every 4-5K miles. I had a tune-up last August when the spark plugs were replaced, but probably not the wires.

A mechanic told me yesterday, that the idle rpm in Drive and Reverse is too low, that it should be slightly higher, and that if it were, the car would be smooth when idling.

Does anyone have any suggestions? I love the way the car drives, and would love to eliminate this irritating rough idle.

Thanks.
Regards,
Mehul