I would like to start with a question, is the check engine light remaining on when you are driving the car? The cabin filter might need to be replaced, it will not have any effect on the fuel economy. The poor fuel economy may well be due to the air filter element, when was it last replaced? The rough idle is possibly due to something like a contaminated air filter or perhaps something more involved, but I always like to start with the easy stuff so that the possibility of a clogged air filter can be removed from the equation.
Saturday, January 15th, 2011 AT 7:59 PM