Excessive Emissions/Fuel Consumption

POOR FUEL ECONOMY
^ Air Mass Meter
^ Coolant Temperature Sensor
^ Fuel Pressure Regulator
^ Oxygen Sensor

ENGINE RUNS TOO RICH
^ Air Mass Meter
^ Coolant Temperature Sensor
^ Fuel Pressure Regulator
^ Oxygen Sensor

ENGINE RUNS TOO LEAN
^ Intake Air Leak
^ Coolant Temperature Sensor
^ Air Mass Meter Connections
^ Injection Ground Connections
^ Oxygen Sensor