The slowdown is suddenly, nissan question, 6 cyl

Hello,
I have a special case with a question wagon, look that when it turns on everything is normal, suddenly the slowdown as if it were more than one spark plug or an injector, and when it takes place on the road it has a small bell.
The board does not show the famous 'Check Engine' and this problem makes it hot and cold. You already have cleaning of injectors with buoy and change spark plugs, check harnesses and apparently everything well and I can't find it.

I hope you can help me with some tips to help me with this problem.

Greetings!!

Hello Manuel, I have the same problem in a 323 Mazda, sudden low of idle with small vibrations was also carried out cleaning, change spark plugs and nothing is more than a year. What they tell me is that they are possibly failing air sensor located online of admission or lamda probe located online gas and finally it could be coil voltage failure. I hope my contribution is useful, greetings.

I can recommend cleaning and lubricating the minimum gear valves and acceleration body, as well as the cleaning of the MAF if your vehicle equips it.