Lsj won't idle
Got my lsj back from tuner after engine build. Car idle sometimes doesn't sometimes. At idle car is at 12-15 vac and 22% throttle. When I put my foot slightly on the gas it goes to 18-22 vac and throttle position goes to 18%.
Swapped tb to ls4, nothing. Went to new stock tb, nothing. Car is now on tune for stock tb. Still won't idle. 1200 rpm is what it's set for.

I'm thinking maybe a bad gas pedal. Maybe in the tune.
Any suggestions

 

vacuum leak probably.

 

what cams and what all is one to the engine