We put a complete TBI setup with a tuned chip and new harness from Affordable injection in my son's truck. The throttle body had a refresh kit put in it when we started this build a few years ago. We started it for the first time yesterday and everything is fine except it has idles around 1000 rpm. I have checked for vacuum leaks, all of the ports are capped of except for the map sensor and manifold vacuum to the hvac controls. I have sprayed everything with brake cleaner while running with no change, even disconnected and blocked off vacuum to pcv and booster. I have swapped in a known good IAC valve from another truck also. There are no codes and the idle screw is backed off and the throttle blades are completely closed. Does anyone have any insight to where my issue might be? I feel like it has to be a throttle body issue since the blades are closed and still idles high.
