My 89 RS with the 5.0 V8 automatic when accelerating (at least once or twice a day) will throw a CEL and give me hardly any power. Like geo metro power. If I pull over and turn the car off and back on. The CEL goes away and I have all the power back. Any ideas on what this is? I cant pull the code because I have to shut off and turn on the vehicle, but when I do that the light/ code goes away.

 

Get an ALDL cable or scan tool and monitor the malfunction flags. It's anyone's guess what code you are throwing.

GD

 

Have you actually attempted to pull codes? There may be one or more stored in memory; the cost to find out is a paper clip.

https://www.obd-codes.com/faq/read-g...codes-free.php

 

I just found out this trick to pull codes! I have code 43 which is either my knock sensor or ECS. Another post had the same issue. Turns out o cant run 91 octane as it causes my engine to ping setting off my knock sensor. I'm running 87 now and it runs 10x better.