Intermitent SES light and rough idle...

[Kevin]

I'm thinking either vacuum leak, which i doubt because the car still pulls well, or injectors going bad. But would an injector cause an ses light?

I only get the ses light on the highway and then not all the time. I drove down to cars and coffee today with is highway nearly all the way and the car was running fine till i happened to glance at the DIC and I had a "service engine soon" light that stayed on till I got back onto surface streets. I don't know when it came on but it was on the highway. The last time I had a ses light on the highway I blew the map sensor hose off but I know that isn't the issue now because it'll break the tires loose in second. So I sit, scratching my head and wondering what say you, the experts....because I'm at a loss.