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The Ford Explorer and the Mercury Mountaineer were both updated for the 2006 model year on a new frame, produced by Magna International rather than Tower Automotive.

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RPM fluctuating while driving

Hi, I currently have a 2006 Ford Explorer 4x4 SUV. While I am driving the RPM will fluctuate and the truck will do a weird shimmy. It happens between around 40mph-58ish mph and again between 65-80 mph. I do have a check engine light on. Last time I got it read it was for gas cap and EGR valve. I am getting the EGR fixed but when reading symptoms of a bad EGR, it doesn't match the trucks actions.

What else could it be?

Would completely replacing the EGR fix this issue?

PLEASE tell me it is not the transmission. AHHHH

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Had the same problem with our heavy motorhome. Found the problem was the old fuel pump had lost pressure. Worked fine a low speeds, but would fluctuate when you gave it pedal. New fuel pump & filter, good as new.

The shimmy ? Is it 'full-time-4WD' ? That may induce the shimmy by the front wheels. It requires a ton of horsepower for the rear wheels to cause a shimmy. Don't go 80 until this problem is fixed !


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Is your check engine light flashing or on solid? If its flashing that's a sign that it's misfiring and you probably need new plugs and possibly coils. If it is on solid and not flashing I would get the codes read and see what it is saying and could be many different things.

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Samantha zal eeuwig dankbaar zijn.

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