Any insight on where i should be looking to try and correct this. If I unhook my HVAC vaccuum line it gets better.
Motor is a 96 vortec with CPC conversion,marine ntake,stock LS1 injectors and stock 5.3 MAF sensor and throttle body. Running the 0411 ECM. I have changed all the tables for the injectors and the MAF sensor. I didnt have this issue when I had it running on the test stand.