Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Do you happen to know what code is being stored?
Does it run normally down the road?Also, was the check engine light on prior to the tune up?
Normally when the check engine light comes on it can disable the stabilitrack, this would bring the message up.
As for the shaking, without the code it's tough to know what's causing it, but since it was after the tune, it might be a misfire from an ignition coil. Either not seated tightly or possibly once disturbed it's now arcing. This could cause a vibration at idle that might not be felt over higher engine rpms.
I think I would start with getting the code if possible, it might help point us in the right direction. Several states allow parts stores to read the codes and they will do this at no charge for you. Then of course I could give you a much more accurate answer. Sometimes bad O2 sensors can cause this type of vibration as well.
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I hadn't heard back from you so I was wondering if you needed further assistance with this?