DodgeForum.com - 2000 dodge diesel

i own a 2000 dodge diesel, i put a superchips programmer in it and never had any codes until i put it in, i was getting P0234, and P0236, i drove the truck the next day and they never showed up, i had the programmer in for not even a week and now the engine light is on and the truck has no power at the take off, or when going up a hill, sometimes you have power if you stop somewhere and start the truck up again, and sometimes you don't, i have lots of fuel pressure into the injector pump, a new air filtler and fuel filter, and when the truck is in park or nuetral it has no hesitation when you put your foot into it, just when it is under load, and now i am getting codes with P0237 and P0238, i bought it used so i don't have the book on the codes, any help would be appreciated, and it has 210, 000 on it