No, you won't improve performance, or gas mileage, by disabling emission controls. In some areas, where there are annual emission tests, you'll also be unable to get license plates with the emissions disabled, and there's still a Federal law on the books that provides for a $5,000.00 fine, and 5 years in jail, for every vehicle on which you disable the emission system.
The absolutely essential emission systems are the EGR valve, the PCV valve, and the electronic spark control system, if your vehicle has one. Others are the evaporative emission system, the catalytic converter, the Early Fuel Evaporative system (formerly the heat riser), and on some engines, a vacuum valve that switches the vacuum advance on and off according to engine temperature. Other vacuum systems control the lockup torque converter in the transmission, if the car has a Turbo 350C trans.
Bottom line- - - -find someone who knows what he's doing, and get the emission controls straightened out.
Jerry
