On my 2009 2.5L Altima I had the dreaded engine vibration in drive at idle especially with the AC running. Checked my alternator clutch and it was releasing in one direction albiet not very well.
Just replaced the alternator with a rebuilt unit and the car is now 95% smoother in gear at idle with the AC on. Seems that was the issue. BTW, I've already replaced my upper and lower torque struts as those were worn out. Hope this post may help someone who's experiencing the same issues.
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