I purchased this used last month (12/10). The day after I bought it, the check engine light went on. My mechanic said it was showing a misfire but no big deal. He reset it and it came on a few days later. He looked again and said he didn't see any misfire. I drove it awhile and the check engine light turned off by itself for exactly 2 weeks. Then, it came back on. Mechanic is having trouble figuring it out. Has anyone experienced this?