Got a 84 s12 with a ka24de swap in it , car ran great for about 6 months , one day it started choking on the freeway to the point of stalling . Seemed I wasn't getting enough fuel , let the car sit for 15 mins and started it right back up . Next day I turn my car on after driving to friends house n it stalls going 25mph . Same thing just choked n died . Got crank spark n air . Have a feeling the fuel pump might have gone out or the fuel pump relay