[Life is Supra]

Hi guys me again,I have a problem with engine because first when cold must crank it two times-when hot re-crank ok at first key.Second when accelerate engine hick up to aprox.1500rpms then goes normal.Third when accelerate and let of the gas to change gear muffler explodes.Am I raning lean or my time isnt right-by the way I set tree washers on wastegate.There is no code.Thanks