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Very rough driving-engine

(1999 Ford Explorer)
in Fredericksburg, VA on November 07, 2010
my ford has 139.000 miles, and I am now having very rough engine driving. doesnt have as much acceleration going up inclines, there is noise in the engine. i have regular oil changes
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on November 07, 2010
Lisa,

I would start by addressing basic tune up items - such as spark plugs and ignition wire replacement. This can cause a rough running condition, and is readily considered good regular maintenance.

If you feel that has been done already recently enough, then it appears a good diagnosis is in order. I do not know which 4.0L V6 you have (there are two in Explorers in 1999...a OHV (over head valve) or SOHC (single over head camshaft) engines...). If you have the SOHC engine, there are known concerns with the cam chain guides and tensioners that cause engine noise. If you have excessive noise, the cam timing could also be slightly off, causing a serious performance issue.

Here is a link to some shops in your area...

http://repairpal.com/ford-repair-in-fredericksburg-virginia

Good luck!
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on November 17, 2010
A friend of mine who works for ford told me to try one tank of Chevron supreme. It made a huge difference, you do not have to do this all the time just now and then. hope this helps.
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