Need some opinions on what I have going on. Motor is an Ls and is having problems at low rpm. When getting on the gas it hesitates really bad and runs really rough until you give it a punch on the throttle. It’ll run on pad like normal and cruse all day but that range from 1-3k Is where it has a problem running smooth. Have checked sensors and installed a new fuel pump just to try and check things off the list. But still stuck where we started. Motor is about 2 years old and has been flawless besides overheating from cracked radiators a couple times and bad fuel pumps.