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Particulars:

2005 V6 4x4
93,000 miles

Symptoms:

Recently, when stopped at an intersection (in drive, brakes applied), the engine sometimes stumbles noticeably. Sort of a rythmic "rum--rum--rum--rum" until you step on the gas to go.

Fuel filter was changed just before 90,000. I am planning to do the 100,000 scheduled maintenance soon (plugs, etc.). Any ideas about the stumble? I would appreciate some direction so I can be sure to attack the problem without blindly throwing money at it.

Thanks in advance.
 

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I'd sure run some fuel injecton cleaner through it. Maybe an injector, or fuel rail issue with that many miles. I had to replace one on my F-150 about that time. Same for a Z tech Escort that I owned back in the day. The cleaner is an inexpensive SWAG.
 

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It certainly seems to be some issue with your fuelling supply, at first.
If while waiting with the engine running you put it at neutral does it do the same thing?Do you see a fluctuation in the the revs counter?If yes, then the idle control valve is the culprit.For double checking:Start the engine at Park.Wait for the engine to warm up.Disconnect the Idle contronl valve electrical connector.Does the engine comes to a stall, or almost stall.If yes, the Idle controller is working.
Another issue might be the fuel filter.
Cleaning the injectors is not a bad idea and not money thrown away for a car with so many miles.
Now the worst scenario could be an alternator which decided to head South and beyond.
With all the accessories off, including lights and air-conditioning and the gear selector at D while waiting at a stop with the hand-brake on instead of applying the brakes.If the rum...rum...rum...is gone or deminished, your alternator needs to be looked up.
Good luck and please keep us posted with your findings.
 
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