Well I have a 1991 RS convt TBI v-8 I have an intermittent code 43 "ESC" not sure what this is or why it shows. Car runs overall very well however power is sporadic sometimes it goes like a bat out of hades other times i can barely spin a tire even if i drop the clutch.......Seems timing related like its gettin pulled way retarded. You think cheap gas cauing fuel knock causing the ECM to pull timing and the ESC code is because it is off the spectrum? Alright guys im at your mercy