Daewoo I wait 1500cc

Hello, I have a Daewoo I wait 1.5 year 94, when I leave without problems like 25 min and after that it starts to pull as if it starts to run out of benzine (it has benzina), when I give AARANQUE it is about 1000 rpm then after minutes lower than 500 rpm and if not accelerated the engine stops, it passes me several times in arrests of the vehicle, they told me that they could be Spark plugs, I have changed spark plugs, spark plug cables, benzine pump, benzine filter and nothing. I need help please.
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I believe that your problem is a bit simpler than that, if your problem is hot revolutions, you have to check first of your IAC valve first, after realizing a cleansing of it, you see whether it improves or not, if it does not improve then with the auto in working temperature I suffer a little the revolution from the pedal adjustment screw, since the normal thing is normal for that vehicle is between 850 RPM, at working temperature, it is normal for these revolutions to be between 1500 and 1700 rpm, it is more in Toyota Yaris, turn on 2000 rpm and progressively fall in the function of the temperature, as the revolutions are so low in relief tends to stop the engine.