it def. sounds like a problem with that sensor or the egr. would this make it send a code? is that temp sensor the one labeled BVSV? im gunna check these few things. if I can't find the problem will the stealer find the problem for me for a diagnostic fee? and if so can I then just fix it myself without them doing the $$$ labor? i would hate to do this but I just want my new motor to run perfect.

sometimes it runs great when warm and sometimes it idles really low and rough cold or warm, but almost always hesitates before gettin on it