first timer. i am the orig. owner of a 02 lightning. all stock. recently the sel came on with a 0401 code, egr. i replaced several sections of the vacuum harness that were cracked. cleaned the egr and tube. i reset the the light several times, but the same code comes back. my ques. is, i read where someone installed a egr delete kit. did away with the egr along with most of the vacuum harness. does anyone know if this will cause problems with the computer and sel. thanks.