2001 e7

Hello. Working on a mack e7. Truck was running fine one day and parked overnight. The next morning when started up it ran rough and blowing smoke . White and it's fuel took a temp reading from each exhaust port and the first 3 are cold 50 deg while running the back 3 were 300 deg. Pulled head looked ok and plugged in another ecu same result. Anyone ever have this problem? Thanks for any input