So today I was heading home from work with the A/C on most of the way and I noticed something very odd when I came to a red light. The cars RPM's got really low. The light turned green and when I took off, the more I gave her gas, the lower my RPM's got to the point that she started to bog down and felt like she was going to die. I heard some loud back fire pops too as I gave it more gas. I let go of the gas, turned off the A/C and it seemed as though everything went back to normal....for the most part. When this was happening, I had the A/C set to about 3 (not full blast but one notch under). But here's where it gets crazy again; since I turned off the A/C, I went ahead and rolled the windows down till I got home (about 30min) but I kept feeling cold air hitting my feet and coming from the defrost vent on the dash. The A/C is off but it's coming out very slow and cold. When I got home I popped the hood and my condenser (the C02 looking thing) was completely frozen with a thick layer of ice as well as the lines coming to and from it. My A/C clutch was also still spinning as though it was on but it was off. I turned off the car and that's when it finally stopped. Can anyone tell me what's going on? Any clue as to what I need to do to fix this? Any help would be great!! Thanks.