I have this code displayed as a current code in my OBD along with 1599 (stall or miss) as history. The car died as I let off the gas o nthe highway but started back up in neutral no problem. It hasn't died since but shows this code (note the check engine light is not lit). The car has a "stumble" to the idle every so often that I haven't been able to track down. There is also a code MSM B1817 that I can't find any info on. What does all this mean?