i just got a 1987 rx7, 13b, i put down a fat burn out and a block down the road i lost almost all engine power it accelerates terribly slow. the engine is vibrating and has a deep low sound. could this be apex, or something, if you know let me know, thanks

 

Sounds like the motor is blown. Do the poor man's compression check to find out if you've still got compression.

James

 

sounds like a blown apex

 

sounds like you've popped your motor....but one can't really tell unless you compression test it and get some hard #s....