RX7 Weird Stalling Issue
 

Hello, I have recently acquired a 1988 RX7 Convertible and am having some issues. To begin the motor starts and runs. The idle is smooth and both rotors are working. The car also does not seem to lack power. However, after about 8 minuets idle and a tad longer under throttle the engine stalls. Not a sputtering stall but its as if I turned the key off. I have re-timed the engine, unplugged the whole harness and plugged everything back in, and checked the AFM although I feel as though this could be the culprit. I am very familiar with rotaries but I just can figure this out. Any help is appreciated...

I should also add that the car does not smell like fuel and will start right up on cold start and after stalling.

Bump...

After it stalls, and you try to restart it, does it even try to start again?

Check the main ECU ground under the intake manifold. If it is loose, you'll see this problem.

Also check your injector resistors (under the airbox). I have seen those connections become intermittent and the result was this problem.

After it stalls leave the key in the on position and measure for voltage on the Black/White wire located in a 4 wire Green check connector plug next to the lead coil. Voltage should be 12 volts and if it is zero then the voltage is being cut for some reason such as the ignition switch, Main relay etc.