why does car ideal rough when foot on brake and car in gear on 2009 Toyota Matrix

it doesn't do it all the time, it has only done it maybe 5 or 6 times

by in Crystal River, FL on May 02, 2013
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1 answer 2 comments
ANSWER by , May 03, 2013
Is the A/C on or off when it feels rough? Or does it make any difference?
COMMENT by , May 04, 2013
Yes the a/c was on
COMMENT by , May 04, 2013
when it's not on does it feel smoother? Maybe mount(s) are weak.