A couple of months ago, I was driving throught the mountians of PA... It was about a 60mile stretch of 6% grade hills going up and down almost constantly.... By about 30 miles in, my cars performance was degrading... by that i mean lacking power. And by about 45miles in... I could hardly climb the hills.... creeping at 30mph..... This has happened once before a long time ago... Is it too much for the car to handle or another problem... like O2 sensor or inproper tranny cooling.... I have the 5spd. Can anyone give me any suggestions?