Are you plugs fouling or spark plugs not getting spark? It could very well be your coil, when performing a tune-up it’s always a good measure to check your coil and insure proper spark. Fits 1958 – 9/1971 FJ40/45, FJ55. Also fits 9/71 – 8/87 with vacuum advance distributor (FJ40/45, FJ55, FJ60) Has internal resistor.