hello yall. i have an 06 f-350 6.0l stroker with only 58,000 miles on it. last night while driving on a road trip i noticed it kinda runnin a lil off. it wont up shift of a moderate accelleration or it kinda struggles. then it picks up! the check engine light is on(the lil motor symbol) im thinking its a fuel injector issue, cause i just changed the fuel filter 5,000 miles ago. it slowly seems to be getting worse. it idles rough with fluxuating low and normal rpm's. the only thing i have done to the truck is put a quadzilla 2 stage and a straight pipe. this is my first ford so im a lil lost. it doesnt blow any blue or white smoke, everything appears normal, just the fact its not runnin rite! any ideas?