rx7man13b

Sea Foam Amsoil powerfoam Whats better where can I find it, Pepboys? Im hoping I just have a stuck seal front rotor has way weaker and different sound then back rotor when I pull plug. I was told to put amsoil 2 cycle cleaner in my carb float bowl and turn engine over with out spark pumping the pedal but before i do anything i need expert opinion . Should I fill the engine up with Marvel mystery oil or ATF
Any help is appreciated b4 I buy an engine