Yesterday the EPC light came on on my 2003 A4. It didn't want to start but finally did, sputtered a little bit and then smoothed out. Drove it home and parked in the garage. Next morning- hard starting again- finally fired and ran smoothly- No EPC light? Hmmm? I hooked up my code reader and found PO322 listed. What is going on?? Crank Sensor causing the hard starting?