My 91 supra was having trouble starting It wouldn't crank so my mech told me it it was the starter so he replaced it with a used one from my parts car the car ran great I drove it around for 2 days but on the third day I turned it off and it wouldn't start back up it had the same symptons as before but I was able to push start the car,someone told me they were having similar problems and the replaced their starter with a new one and they still had the same problems until they replaced the ignition switch.Could someone please advise