IAC Chevy Valve problems 2006

I lean more than the fault is the coil, because you say that the car loses power, the failure of the IAC valve is different and when the engine fails it does not lose power, it only accelerates too much or turns off

Analyzing with scanner the codes referring to Missfire General are detected on some occasions and fails in the pair circuit of the automatic transmission (depending on the case. New and coil cables have been changed and the phenomenon is still presented that sometimes the car does not turn on when it is very hot (within the normal range) or very cold (in the mornings for example) and the light is manifested Specifically, and when it is very difficult to change to D. the problem is solved in most times waiting for the car to hot, then turn it off and turn it on again. detected. They alternate. The cables and the coil change, since the latter is very susceptible to damage
. Generally in heat and drop by drop, it evaporates due to the temperature of the engine and does not have runoff or visible dripping under the car and still seems to gradually lower the level of the antifreeze. Fugue in the front stamps (above the oil filter and under the exhaust multiple, the three are continuous) can be removed without disassembling the engine
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Hello thanks to all for your contributions. As Juanitapanchito says, the fault is not constant, but if it has overheated, at this time there is the Engine sensor on for some hrs. The only thing I detect is that it loses power in the change of speed (the car is automatic) and in the high vibrates a little in front.
I will take it again to review and post the result.
Greetings