Your 88 corolla fx idles roughsometimes worse than others Sputters off idle sometimes has an oder at the tailpipe like rotten eggs Always poor mpg Whats upyou removed vacuum to the egr no help?

When you get an odor of rotten eggs coming from your exhaust it means that your Catalytic Converter is pooched. You must replace it. Call around to get the best price. The Catalytic Converter is a part of your exhaust system. Your exhaust system must be free flowing in order for your car to run well. If your car is sputtering and gets poor gas mileage it is because your Catalytic Converter is plugged up and needs to be replaced. Your car will most likely run much better afterwards. Good Luck! Jim.