ok my 88 2.3L is running really really rich. used to get 340miles/gal with around 1/5th of a tank left, now i'm gettin 220mi/gal around 1/5t of a tank left. 15 gal tank so ya its pretty bad. does ne one have ne suggestions on what i may check out? i had midas hook up diagnostics tool, whether or not they did it, didn't read nething bad. car has a header O2 sensor is tapped into the #2 cylinder on the header. CAI is installed, egr valve is disconnected along with the egr sensor is unhooked. and yes i have been stayin off the gas. ne good suggestions are appriceated.