If the car has been sitting overnight I can get in, start it up and drive as long as I want without any issues. However, after it's reached operating temperature if I go to restart the car after it's been sitting for 20-30 minutes, the car starts but runs really rough. I don't think it's related to an idle setting because I can drive it for several miles after restarting and the car feels like its running on only a few cylinders. If I let it sit overnight it will work fine again in the morning. Has anyone ever seen this issue?
I thought it was related to heat soaking of the IAT which was placed where the EVAP sol used to be, but I recently relocated it to after the intercooler and had the same issue.
-5.3L 7875 turbo
-IAT right after the intercooler
-IAT bias off
-SEP 1500cc injectors