2003 Ford Expedition car is vibrating, and check engine lig

2003 FORD EXPEDITION
38,000 MILES • 4 CYL • 4WD • AUTOMATIC
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KLOCK97303
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Our 8 year olsd turned the switch to 4L and I noticed when I was driving the car felt like it was vibrating when driving and when I would put it in park or stop at an intersection it would vibrate and sputter like it wasgoing to qiut or run out of gas. I put it in nuetral and back into 2W, however no change and the check engine light is on. My husband checked the oil ans said it was about a quart low so he topped it off. Any ideas what is wrong with it? Also is it safe to drive it like this?
Nov 3, 2008 at 2:06 PM
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BMRFIXIT
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Check on top of engine for vacuum leak
start engine and listen for a suction noise
very common PCV valve lose
Nov 6, 2008 at 9:22 PM