I am driving an Isuzu Crosswind (XUV) 2003 model. I am started to have problems going uphill or even just going up from the ramp in our basement parking. It's like the engine will die down whenever I try to go up the ramp and my AC is turned on. I had to turn off my AC and accelerate into a certain amount of speed so that I can go up. And by the way, the ramp is not that steep too. Any idea whats wrong? Thanks.