Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › 1996 chevy c1500 5.7l LTFT RUNNING LEAN UNDER LOAD › 1996 chevy c1500 5.7l LTFT RUNNING LEAN UNDER LOAD January 21, 2020 at 12:32 am #895849 Richard KirshyParticipant Might suggest smoking the engine. Also check / smoke the EVAP system for leaks.