When I'm driving the car it sounds like it goes into electric mode and the car loses power will not go over 40 mph

When the car is moving the A\C works, but when its hot the A\C cant keep up. Also when the I'm stopped the A\C blows hot air.

When driving I get a roaring noise coming from the rear area or auto. Passenger in back has said it seems to be coming from left side

Gas pedal problem. Driving along foot on accelerator -no power -my son and husband pressed their foot all way down on the pedal does nothing. The lack of power has happened five times. Two of these ti… 

I have a 2005 altima,4 cyl,4 door. I jusy got it ,its been certified but theres a rub noise when i turn left and right,no screeching or grinding or clunking,,just rubbing,,