yes it?s the same hummer, we had Nate kuhle build our base tune then he backed out, I think Derek said he was able to fix the fuel trims but I?m not...
One more thought, if this is on an engine stand (without the load of the torque converter fighting a transmission in Park), then that may be part of...
There are problems with the idle and other areas of the tune. Be that as it may, I don't see any reason why RPMs would climb to 3500 rpms. To me the...