I know this has been done, but I can’t find any specific instructions on how to convert my LSx TBI harness to MPFI without buying another $400 harness. I know I can use my TBI for its sensors and add injectors to my Holley single-plane manifold or would it be better to the stock LS 5.3L truck manifold?

I’m having driveability issues that I just can’t seem to tune out and every tuner says the TBI is the problem. Not that's it's garbage, but it has its limits for sure.