406 rpm drop Gas doesn't eat

Hello friends, how many times I have been asking a situation I have not been to the master yet, I have 2000 model 406 SV model vehicle, sometimes when I start the car, it does not work in the period that should work normally, it falls from 0 to 10 on average and goes over a little, it does not eat when I give gas, the engine also shakes quite a bit It turns on the malfunction lamp, but when I turn it off again after a few minutes, there is no problem. Neither the malfunction lamp is on, nor can it cause anything else. & nbsp; It can do this even when the engine is hot.

friends, I guess nothing has happened to anyone :)

I think gasoline car spark plugs look

It controls the fuel system completely. Throat or something, clean it or try it if you want.