Q&A

I cannot find any technical service bulletins for this concern. There are a couple of conditions that we need to know, first when the engine starts to idle slow, do any noises occur? Second, does the alternator warning come on before the engine stalls or after it stalls. If a squeaking noise occurs when the AC is turned on, you may have an AC compressor starting to seize up internally. The engagement of the compressor clutch when the compressor is going bad will cause an excessive load on the engine causing the low idle speed. If the alternator warning comes on or the voltmeter (if equipped) reads low, it may have an excessive current draw from the electric cooling fans,(there was a recall to replace these fans). The last items that could cause this problem are electrical, there can be a loss of communication between the AC control module and the engine control module or a bad idle control valve. It is best to find a reputable shop to try to repair this due to the high cost of the parts related to any of these possibilities.

Unplug the ac under the hood and see if it stops shaking. If it is caused by the ac it probably does it with the defrost on as well. The weather making a difference makes me wonder if it's your MAF sensor.

I called my mechanic about the same problem. He told me that 99% of the problem is from the A/C being low on A/C Freon. The compressor is turning on and off and that makes the idle to go up or down. I went to pepboys and bought a do it your self kit and my idle problem went away. Plan to buy a few cans though.

did check if you have any air leak in any of the hoses?. try to listen carefully when you open the hoop
dose the shaking happens like fast vibration or you feel something like "if you want to catch your breath after running."
when you shift it to D, any change in the shaking?
if you put it in P or N, and accelerate it. and good?
these happens with air leak.
fuel filter could be another reason.