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
Ist dies eine gute Frage?
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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 !
von Tom Shafer