I just swapped a 2002 3800sc from a regal into my 86 fiero convertible. I disabled codes P1626 and p1629-p1631 and changed it from serial to PWM. The car still starts for a second then dies, it will run like Shiite on starting fluid. Now I have codesp0452, p0463 and p1189. I read that the regal PCM vats can't be disabled in the tune, any truth to that?