3.4 problems

i have a 94 camaro 3.4 and was wondering if anyone knows why when you have the a/c blowing and i accelerate it starts blowing in the floor until i level off,then it blows out the vents like normal.
also,my engine idles at almost 2000rpm sometimes,but not all the time.i have reset my computer and it would stop for about a week then start back.
any help for me?
thanks

sorry no help on that. Any mods an your car though?

flowmaster,borla tips,gutted cat.17 inch enkie katanas.red seat inserts(grey interior),red headliner(car is red).stereo.high rise spoiler.used to have air ride and wings west kit.want v8,22 inch wheels,new kit,& more air ride