Rough Idle with A?C running

Hi All
I have a 2002 Chevy Malibu with the 3.1 Engine. When I'm stopped at a traffic light with the A/C running, I get the worst vibration from the
engine. If I throw the Trans into Neutral the vibration goes away. If I shut the A/C off it lessens it. What should I look for. The Car runs Great at all speeds and starts everytime. I've owned this car for about 3.5 months, the used warranty is about to expire. Any thoughts? suggestions?
Thanks in advance
Larry
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

What should you look for? The dealer that has the warranty on it.
When the AC is on, the computer tells the engine to compensate for the added load. All sorts of thing are supposed to happen. A competent mechanic can easily cure the problem. I can't fix it, but I do know to go to the dealer if it is a warranty issue.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.