We swaped a gsr into a 1993 civic vx and it was already obd1 so no issues there we are runing the p72 ecu and might be missing sensors. Do not no for sure. The car is fast as fuck untill it hits 80 mph and then it backfires and spits and sputers and then dies and we pull over and it starts right back up. Want to run the car and get 1/4 mile time but cutting out at 80 isnt going to cut it. CAR: 1993 honda civic vx Enigine: 1994 J Spec GSR ECU: p72 Known parts missing: one of the throttle body sensors and a vaccum line missing on manifold and throttle body. PROBLEM: Car Runs Great Till 80 milea an hour.