I have a 91 non-turbo RX7 and the check engine light flickers on and off. I have noticed though, that it mainly goes on when I let go of the gas, and I think it may be because of the idle. I say that it may be the Idle because it seems to go off when I reach about 1500RPMs. Any information would be greatly appreciated.

 

you need to check the error codes on the ECU! try this link...
http://rx7world.com/89-91_info.htm

 

Thanks for the Help! Much appreciated!

 

Prolly a cold solder joint at the CPU
Or a bad ground somewhere.
But I would pull the codes to be sure.