Code 13
 

I have a 1990 rx7 n/a my friend hooked a snap on brick to the car and it brought up code 13 over and over cycling its self does anyone know what that code is... thank you for your time.

code 13 pressure (map) sensor. i've got the same deal. when engine is warm and you give it gas, the check engine light flickered and it kinda stumbled. pulled code 13. idle is up and down and when warm it wants to stall unless you give it gas.