2004 XJR Code PO 300

Looking at buying a relatively low mileage (50k) 2004 XJR. It has a check engine lite on. My obd2 reader throws a PO300 code - “Random/multiple cylinder misfire detected”. Spoke to the local dealer - they are good guys - could be multiple issues. Has anybody had this experience with their cars and would share it with me? Car runs well no actual miss detected.