Nissan Altima: ENGINE HAS NO POWER

MY CAR FIRST BEGAN TO STALL IMEDIETLY UPON STARTING ENGINE. WHEN I GAVE IT
GAS IT WAS FINE. OCASSIONALY IT WOULD STALL OUT AT RED LIGHTS. TODAY WHILE
DRIVING HOME FROM WORK, MY A/C STOPPED BLOWING COLD AIR, AND NOW THE CAR
HAS NO POWER WHEN I TRY TO TAKE OFF. EVEN W/ MY FOOT ALL THE WAY DOWN ON
THE ACCELERATOR IT IS ALMOST IMPOSSIBLE TO TAKE OFF OR IT STALLS OUT. ANY
IDEAS AS TO WHAT THIS IS? I DON'T HAVE A LOT OF MONEY TO SPEND ON A
MECHANIC, I'D LIKE TO HAVE AN IDEA WHAT IT IS BEFORE TAKING IT IN.

I am so insulted that people would take an innocent person with real
problems and give them more. I'm also sorry i offended anyone with my
capital letters, I have more important things on my mind. You_know_who can
go You_know_where!