Hi, so I need some help here. I’m new these forums. But anyways, my ford ranger keeps backfiring. And I can’t drive it because the engine turns off after it’s been on for about 1 min. I already changed the spark plugs, idle air control valve (code i got). I change the 2 coils. I haven’t changed the wires yet. Didn’t think it would be the problem. What can it be?