[Toyota87Supra]

I have an 87 turbo 5 speed and i am not getting any spark. i was getting spark and then i tached the engine out and the car died and lost spark. i occasionally get spark from the 5th plug but only after the car has been tried to start not while the engine is trying to turn over. Im thinking maybe a short circuit or somethin but id like to see what other people think first. please help.