back firing could be a hole in your exhaust system.
if you doubt your timing is correct...
http://www.cygnusx1.net/Supra/Librar....aspx?S=IG&P=1
its not hard to check if your belt is worn either:
http://www.cygnusx1.net/Supra/Librar...Section=EM&P=7
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1984 supra - 1uzfe - w58 - 4.10 - 1 piece aluminum shaft.
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