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Check engine light on 2003 Ford Explorer Sport Trac

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check engine light is now on, vehicle does not idle very good, will even die at times.....vehicle runs great down the highway.
(2) Answers
You probably want to have a diagnostics check done, but I was experiencing the same problem and it turned out that one of my vacuum hoses had a leak. I had the hose replaced and it has run great ever since.
I'm not a mechanic, but I would get a fuel system cleaning and have the run a computer diagnostic on ur engine.