Ryde _Or_Die

Alright I think I may have low compression on my TII so I am planning on doin the ATF trick to try to bring it up. If I have an oil or coolant leak into the engine could it make it worse or possibly fix it? Any input would help. My car smokes some now and doesn't pull like it should. Also, what causes low compression? I have heard of wear on the apex seals but my engine was rebuilt not too long ago.