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I had already tried stock tune it ran the same. I made 10 tunes raising idle, increasing VE, adjusting injector flow rate for none return system, running fuel return and none fuel return, Copied...

Thanks for everyone?s help. Ended up being bad ecm or bad hp tuner load. I?m a little soured about that this was my second tune that cause me ecm and credits to unlock but may it was just a bad ecm.

I do have 12v through surge out of fuel pump control relay and standalone run relay that powers ecm and engine control.

so that is with stock intake tube and 48psi vacuum controlled fuel pressure. I did try to set this up as returnless fuel but have gone back wards till i can get this to idle. I had idle turned up...

I have tried to record longer data but it wont come open loop but im not real sure why. ran engine for 10-15 i can force it but it wont go on its own.

Hi i am on my second tune first being afm on 15 suburban which went good. Now i swapped 5.3 into my jeep out of 03 trailblazer. it is stock with different intake pipe no cam all parts of of good...