:look:starts ok,run good till it warms up then stutters shutters and dies by the time it gets to high gear. 2001 f250 super duty 4x4 w/220000 miles. no codes,dropped tank replaced broken ring that holds down fuel pump [plastic tank] screen is clean.new fuel filter.anyone have an idea where to look next? from what i have gleaned by reading other posts i'm thinking IPR sensor.:dohk no help so far,so i coughed up the $268 and replaced the IPR,that was NOT it.can anyone help me here?:doh: