i recently bought a 93 mazda rx7 fd3s. i am having a weird problems it stops suddenly with a check engine light and the rpms also fall rapidly. i took it to aamco to get the check engine light code but when i turned it back the check engine light is gone and aamco guys did not find any error code. So i am confused now and dont know what the problem is. It happens every once in a while. but when turn it off and turn it on again its back to normal. So can any body help me with this, how can i get rid of this issue?