I have a 91 FJ80 with the 3FE inline 6. I've been having issues lately where the engine cuts out, shudders, backfires or dies when I'm driving. It happens for about 10 seconds and kicks back on again. Seems to be agrivated when the engine is warm. Haven't had issues before, but I just got it and handn't driven it but in the neighborhood due to me doing repairs. I had an electrical issue, which I think was the neutral safety switch, but its running again now. Unfortunately, it's now running worse and cutting out more often even a low speeds. New spark plugs, coil, wires, checked grounds. Thanks!