problems with my corolla 91.

Greetings friends, my problem is that my corolla 91 sometimes feels accelerated others is kept under, with the same working conditions I have taken to the mechanic on several occasions and I have reviewed the cooland sensor, ignition, air flow, gasoline filter, empty hoses, gasoline pump, generation, etc. This is a very rare and annoying problem, because this every time I stop and I have the march low, so I have to put the car in neutral so that it can keep a little.


My vehicle is a 1991 Toyota Corolla, it is Fuel Injection, American version.

I will be eternally grateful for your help, thank you.

hello.
I see that you have made several verifications, but I would like to know part of checks what changes you have made. The other is your car automatic?
What could tell you that it is a common symptom of idle regulatory valve, clean it and this element is important the other one you can make is to change all the packaging of the admission system may some of it is broken. You can start with this and then tell us.
luck....

The first thing is that I thank you for being interested in my problem, thanks for the support, and with respect to the vehicle I tell you that I have changed the stamps of the entire admission system, including the injector stamps, and I also change the air filter, my vehicle is automatic, and finally I would ask you to please explain to me that it is the valve slowed down because I am not familiar with it. Where is and what to serve, because I am something new with the subject and I want to learn to know more my vehicle, thanks

The Relay or IAC valve or step -by -step motor, the valve that is responsible for regulating the release, is used in the admission body where the butterfly is, it is responsible for delivering a greater flow of air by means of a bypa, or a lower flow for cold starts when this valve is dirty or in poor condition go out, a symptom of this valve is to see that the needle of the revolutions ascila alone in Neutro Suve and low that is a signal,

Again thank you for the contribution, and I tell you that your answer is very satisfactory for me for adjusting a lot to the reality of the problem and immediately put your advice into practice to see the results of cleaning this valve, then I will tell you everything, thank you.