MUSTANG042004

Hello all I have a 2011 mustang v6 and been having some issues with it. The car seems to be idleing rough and when I turn the ac on it really gets bad it sounds like it wants to turn off. Lately I been earing a squeel at idle it kinda like eeeeeeee eeeeeeeeee eeeeeeeee but when i hit the gas a little it goes away then comes back at idle. Do yall think it a vacum line or something, already took it to the dealer and like always the car acts so perfect. Iam pissed cause I go home and its startes acting up lol it like they know or something. I just wanted to hear yalls opinions about it this way I can tell them what to look for instead off them saying I dont hear nothing.

Thanks

MatthewR87

Has it been exhibiting these symptoms since you purchased it or is it a recent occurrence? If it is recent then a bad batch of gasoline may be to blame for the rough idle.