Why does my car die when it slows down/stops?

It literally dies every time I either brake or let up off the gas, but starts back up fine. I recently changed 3 spark plugs (1 had stuff in the way and I was strapped for time). I plan on getting to the rest tomorrow. What could cause this?

I'll also add that, when it slows down, all the lights get dim, but when I accelerate, the lights go back to normal

The car is a 2004 ford explorer eddie bauer 4.6L

That sounds like your not getting enough electrical output from the alternator that keeps the engine running and the battery charged. It also could be the engine timing. If you have an RPM gage, the engine should be idling about 700 rpms approximate to keep the engine running.

The idle speed is probably set too slow, and it's dying while your car is slowed down.

Get it scanned and the codes interpreted before you go any further.

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