IAC Chevy Valve problems 2006

Hello, I have a problem with my Chevy 2006 Automatic Transmission. It has been six months for the light mir on the board and a tremor in the engine that I consider moderate, but it lacks power and the speeds take to change, as they are formed. At the beginning Ceia was just the finization, but due to lack of teamy and money I did not do it until a month ago, but nothing, it remained the same. Then clean the IAC valve that was a bit blight, disconnect the battery to reset the computer settings (a mechanic told me that it was made). When I turned it out, Mir's light went out, but as he was shaking more, but after one day driving regularly, he took a little off, but Mir light turned on again. I do not know if the valve no longer serves or is another bear, ah, also when I turn on the air conditioning compressor, with the changes in parking, the engine is turned off, and when they are in "D" or other speed it does not go out but it is forces. If someone could help me see if it is the valve and if it has to be calibrated or if it is something else. THANK YOU

Hello good evening.
I can tell you that you could verify if you have on all the cylinders and verify if you have any aspiration for the admission of the engine,
luck ...

Thank you, I'm going to check it.

IAC valves can be measured and calibrate but I do not think it is your problem, put a diagnosis, usually the IAC does not pass through the computer which means that the fault is another.

Thanks for the data. When I did the tuning I realized that the spark plugs were calibrated to .40 when in the chest indicated that they should .35. Then the new spark plugs put them tailored to. 35. The oil also brought it from 25W40 when it is supposed to have 15W30. Then he also changed it to the indicated one. He had no problems. I don't know if this affects something. According to me, if the spark plugs were wrong, I would produce explosions or not scratching flat, but if someone has more knowledge about it, they would be appreciated. THANK YOU.

Only to add, all affinations and services were made in the agency.