76 FJ 40 that runs good when cold but cylinders 3 & 4 done show any spark when warm. Do I need a new coil. Plug wires are fairly new. Is timing the problem. Spits and sudders at idle.
If you have an inline four cylinder I'd suspect a failing head gasket. It may be opening up when warm and causing a compression loss. Warm it up until it starts misfiring. Then compression test those two cylinders. If they're very low or zero then it's most likely a blown head gasket between those two cylinders. HTH. -Jim
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