Car shudders violently when driving 45 MPH once it is warm?

2006 FORD FUSION

135,500 MILES • 6 CYL • 2WD • AUTOMATIC

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The first time the check engine light came on and #3 ignition coil was changed. The problem continued. Transmission fluid change was suggested and done. Problem continues. The car also needs a new flex pipe. It was suggested that it was causing a backflow issue. Does this sound possible?

Jan 23, 2023 at 6:36 AM

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This sounds more like a misfire problem; I would replace all spark plugs and the remainder of the ignition coils. Here is a generic guide to help you change out the spark plugs with instructions below to help you with your car:

https://www.2carpros.com/articles/how-to-change-spark-plugs

Spark Plug .................... AGSF-32WM

You must remove the upper intake manifold which I have included as well. I would also service the throttle bore.

here is a guide to help you:

https://www.2carpros.com/articles/throttle-actuator-service

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

Images (Click to enlarge)

Jan 23, 2023 at 11:09 AM