run an injector flush through it. i got a little more kms from a tank afterwards. but my car has been running fine *touch wood* and will continue to do so
also, clean the AFM, do an oil change and filter, make sure the airfilter is clean, replace if necessary. also, check to make sure you have the two silver 'dots' on the plate in your engine bay to make sure its been 'fixed'. there was a recall on a few things...... if they havent been done, the compliance place should be responsible for it