Ok performance problem with my 1989 Buick Electra Park Ave . Engine light comes on sometime runs bad. Then I can stop, shut it off, and turn it runs fine. Sometimes when I slow down or idle the engine light pops on. Don’t have a way to run codes. Just need a general idea of what might be wrong. So I can start replacing and troubleshooting
I will do better than a general idea. Here on our site I have made a page that shows you how to pull GM codes without a scantool. Follow the steps provided then click on the exact code on the page for a complete description along with possible causes.