i have almost the same problem, i took my lightning to work one morning and not even 1/4 mile from home it starts surging, once i stop the truck it stalls... get it home look through my snap on scaner.... no codes, i troubleshoot it and it says if the map sensor is below 153 hertz suspect maf or map, i replace the map and still starts and stalls, maf is reading properly, i cleaned the maf, just put twin walbro 255lph pumps in. now for me the cracked "y" makes sense. for u there are 2 relays next to your fuse box under the hood these change voltage for fuel pressue to be high at wot or low under normal driving. i would think to check this
i just seen the post is from '04 but its good to know some more details
Last edited by Bowtieshreader; 07-22-2010 at 08:42 PM.