Engine Performance problem
2001 Saturn L300 6 cyl Front Wheel Drive Automatic 121, 00 miles
I took my car to get an oil change, and before I left the service center, the " Service Engine Soon" light came on. The tech told me to drive the car for a few miles, and the light should go off, which it did; however, my car has been stalling, losing power and at times unable to start ever since (no such problems prior to oil change). I changed out the crankshaft position sensor, and the car isn't stalling, but the " service engine soon" light came back on! HELP!