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RE: Cold start OK Restart slow: Is the engine cranking slow or is it slow to fire up? Could be couple of things.A) Yes, a bad coil could have internal shorts and is overheating reducing output on re-start. Don't need fancy/pricey coils. Original correct Ford coils work correctly. Would not recommend High Intensity Coils (40K volts) they will burn hole in top of piston. B) Make sure the choke is fully open on re-start. C) On 1966 Bird make sure the Heat Riser ( mounted below passenger exhaust manifold) is rotating (opening and closing) easily. Test rotation when engine is COLD. D) Engine should crank at same speed and sound the same with hot or cold engine . If engine cranking speed is slow on hot engine , test Battery and starter and check Ignition timing . All three will result in slow engine cranking on hot engine.
E) On re-start, does engine TEMP read very hot. Ever had radiator boil over? On engine rebuild, did they pop the freeze plugs and flush the block?
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