could be lots of things and if you plan servicing that ETEC get the EV diagnostic software to help out.
https://docs.google.com/document/d/16BAQLd2i43h30MTOuWJ0-T6_DO9wX5yK5MzOOunwzUk/edit
A sane EMM can only mess you life if it detects a sensor fault or various specs out of range incl...