my truck surge or surging it will crank up run good but will cut off at light

Scan test and fuel pressure test needed!!

remove ignition control module,take to az,adv and have them check it,bad to give problems on these chevys.have them repeat test at least 4 times to heat it up some.

if you mean the module take it back and have them test it ,could have given you a bad one , also unplug egr ,if no diff its bad, salvage yard $5