Motor problem 3.1 Chevrolet Malibú 1998

Good morning I would like to thank the opponent to participate in your forum because it is very useful, my problem is the next time I turn on in the morning my car accelerates a lot with the passage of the minutes that acceleration low I made oil change, spark plugs, wiring, air filter, IAC valve cleaning. When lighting it, the acceleration that I mentioned were presented and I felt the most stable engine however on the third day the engine began to feel as if it had not done anything. I hope someone has already gone through this and I can help me orient me where the fault can be because with the mechanics you never know and many times they leave you the same, that if they get good money.
thank you so much

Good afternoon, when are you running in the car works very much? And when do you reach a semaphore how do you want to turn off? You probably have to step on the brake and ase that does not turn it off, or put it neutral, that would be common failures when it is the IAC sensor is not regulating the air Vien, if you cleaned it, you could see you pull wet, but the best thing is to go, it is the problem, it marks the yellow lus on the board? Camviale the new sensor and take off trouble, oh, if where the sensor goes in the VSE, it has 4 1/2 nuts, you walk the package and clean it very well the hole that goes to the IAC censor, it would be much better, and let me know how it went, greetings.

Thank you very much for answering, notice that the light of the traving is on and the day I gave your service went out at the time of turning it on but then when turning it out and turned on again, the light turned on the light. And if when I go on the road it works very well but by decreasing the speed for example after the service I went from purchases to the USA and while I was driving by the freeway to 70 miles it worked very well in fact I felt it as when I acquired the vehicle (it is second hand but when I bought it or noise towards it was in very good condition since I bought it to a retired American) but when it reached a semaforo at the time of lowering the speed was very treated. It did not go out but he felt very unstable. By the way I did not mention it in the other MSJ but when the car began with that problem, the gas cosumo increased considerably.
Greetings and thank you very much I wait for your comments

Well, as I tell you, go the IAC and you will see the camvio and remove the vase and clean it, because it is filled with a lot of tisne, the IAC will cost about 40 dlls, it is common in those engines that are damaged the IAC, such as the boats of the ship (in take) the coils and even the fucible of the transssion (a red 10) Transmission. But giving it maintenance, the engine lasts a lot, when you look that the aseite has as water but does not heat up and turn on and it has power are not the heads or the chokes ,,,, only you walk the chips of the ship that is arranged from the heads and that wears 8 measured screws 10, and with that it has, it has what happens to these engines, this is what happens to these engines. hand, the general engine worked a lot of doubt, who we are

Thank you very much for your help this weekend I change the IAC and I tell you how I was
cordial greetings
Marno Medrano p.