Hi   Im struggling with an issue with my car and cant pinpoint what the cause may be. Perhaps someone here can help on my 1.8 toyota avensis 1998 Im having no driveabilty issues with my car which is causing me some confusion, but have conducted a vacuum test after a after a mechanic suggested i had a vacuum leak. some events leading to issue: April 2018 . Rusted exhaust system - replaced whole exhaust and cat June 2018 . Passed emission test Nov 2019 . Engine warnin