2tallromero

Found the problem guys thanks for y’all input really appreciate it so the motor that I bought had dad a different fuel rail and fuel injector took my old ones from blown motor cleaned them out them on boom! No check engine and running smooth! After 7 long months lol ? I think the computer does read that fuel rail or some idk

I’m thinking I’ve been lied to on the year of the motor I did the swap with because I’m reading that 2014-16 use a slightly diffent ecu

New to the forum so I have 2017 slt Sierra 5.3 that has headers intake and tune, motor blew at 76k miles swapped the motor for another 5.3 from a 2018 with 23k miles but get power reduced my mechanic can’t find the problem says all the wiring is reading the correct voltage and the ground is good has been sitting for 7months already and can’t seem to fin the problem can anyone help me out?