gmac4826

anyway, i am having a problem with my radio in my truck. its a brand new xxx-nt with the jr xr2i radio. i ran through break in with no problems and even got a couple tanks of gas in with no problems. then i went to a park but my truck started acting strange (slow responce, no responce, losing control) but i dismissed it as interference from the construction going on across the street. so i go home and start it up and run the rest of the day with no problems (except an air leak but thats fixed now). then i brought it out the next day and it started acting strange and took off into my garage so i called it a day. tryed it the next day and no sooner did i get the car started it took off. first the steering pulls all the way to the right and i cant turn it back and throttle response is slow if i get any responce at all. then the car jsut goes to full throttle and a go shut it off. it happens at anytime, when i first start it or even after i have run half a tank of gas. i have replaced the batteries and havent gotten anything wet. CAN SOMEONE HELP ME????????