My runner has been acting up lately (past month or so, but getting progressively worse). I have a stock 97 Limited (5vz-fe) with about 90K. Also have a K&N air filter if that makes any difference. When accelerating it seems to skip or misfire. The check engine light comes on ramdomly and stays on for the rest of the day, but goes off the next. Every once and a while (in the past 2 weeks) it won't start on the first or second try. Any suggestions before I go spend $$ at the shop? Thanks in advance...