I have a 1998 V70 GLT that I was just getting ready to sell (5 kids, getting to big to sit in the third seat)... I was running one of the children to an actiity, when the car suddenly started running very rough. I took the car to a local shop to read the trouble codes, and he told me I needed tune up as it was displaying 302 (misfire on cylinder 2) 304 (misfire on 4) and 300 (general misfire). It didn't make sense that this would suddenly happen (unless there was a crack in the dist.) but I tuned her up anyway. Car still runs the same and gives me the same codes. Any thoughts? Thanks!