Nissan Maxima 1999 3.0 litre V6 Saloon S. (In Japan this model is named 'Cefiro') I have had this car completely topped tuned, new plugs etc.etc. It still idles rough every now and again.
I have used injector cleaner additive to the petrol. This seems to help, but only for a short time. I think it improves when I fill the tank with petrol, but that may be only coincidence.
Besides the motor idling rough I sometimes experience a 'flat-spot' in motor reaction when I dramatically try to increase speed coming onto a freeway.
Any ideas out there what it could be?
note: I have been unable to take the car to a Nissan service outlet as getting a suitable appointment this close to xmas is causing some problems.
TIA
Rob