1997 Buick Skylark 4 cyl Front Wheel Drive Automatic 180000 miles
Engine has trouble starting, very poor gas mileage and hesitates. I have replaced plugs, coils, connectors, both oxygen sensors, MAP sensor, IAC module, air filter and cleaned injectors and throttle body with an over the counter throttle body cleaner. Still the problem presists. The code that it produces says multiple misfires.