[Bassasasin]

Not exactly sure.
I belive I read something like the problem must exist for at least 15 seconds duration before it will store a SES light on permanently depending on the code.

There are other systems that will not even set a code that will cause problems.. Fuel delivery and such.

Perhaps you may want to post a discription of your odd performance and we could bounce back some possibilities.

How many miles on the car?
What kind of car.. Year, Model?

Have you replaced the battery recently?

You can get the codes read for free usually at a parts store.


Good Luck.