Ok, so I've got an 850 non turbo with 210,000 miles on it. It's decided it wants to start stalling out at the occasional stoplight. Yesterday it did, I got it to limp back home, it ran fine while i was on the gas, but when i let off, it idled at about 500rpm. So i thought I'd check the plugs and they were quite old, so i replaced them. I put new bosch +4's in, and started it up, it ran well so i pulled it out, and called it a day. So today it dies on me again, at another light, after about 10-15 minutes of driving. I tried twice to start it with no avail, but it did on the third try (about 10 seconds from the time the engine died). Then it was fine and I got home. Now i'm wondering if you guys have some suggestions on what it could be. Someone said that the fuel pump/relay could be bad, and i have yet to jump it to see, but would the relay really reset itself after 10 seconds? Also, wouldn't it die while running and not just idle?

Yesterday, when I got it home and got the plugs out, they smelled like gas. And when i ran it today it seemed a bit rich.

BTW, there are no codes...

Anyone know where to start?