1998 Buick Lesabre running poorly. Starts and dies. MAF Mass Air Flow Sensor issue. You can see the value of a scan tool. On this car the MAF sensor was tapped on with a screwdriver or something and actually caused the car to run differently as well. You can try to do that to make your car run worse or better for testing purposes on most any vehicle with a MAF sensor. same issues on other cars, Chevrolet, Pontiac, Oldsmobile.
