It was the JLT intake. Changed it out for a new one. Fixed. After all that shit. They changed the mold and made it more robust around the sealing points.
Back when I had the originals MAF sensor on my high mileage GT, I’d have alittle bucking and weak power starting at the 3000rpm range, it was a combination of bad MAF and poor air filter fitment.
Check the MAF sensor voltage for a reading with engine off but ignition on, should read 0.00 volts, if it shows voltage then it’s bad.