To some extent I agree with you. Fuel restrictions can cause that. But if your vehicle is running fine (engine not sputtering or there is a loss of power) - no driveability issues, then it is more than likely that you have a problem with your IAC valve. In my case, I didn't know this until...
Further to my post above, Long Term Fuel Trim +STFT readings must be under 10% to be ok - the closer to zero the better. LTFT readings must not increase on acceleration. Finally, Fuel Trim readings are read first at Idle, then at 2500 RPM then at WOT before the whole picture is obtained.
From previous experience and from Youtube, I have learnt that this problem is due to the IAC Valve being defective. It is NOT normal for the fuel trim readings to increase on acceleration.
