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How many miles are on the vehicle? It sounds like torque converter shudder. Not transmission shudder. See this link. https://www.broncosportforum.com/forum/threads/torque-converter-shudder-adventure.11649/

Did you happen to update the Navigation Maps yet?

Doppler app for iPhone has not been updated in over a year. This app may be risking being dropped from the App Store. I am sure there are compatibility issues with iOS26.

Do you have the Ford Pass app on your phone? Have you paired your vehicle to the app?

Please see this link. https://www.broncosportforum.com/forum/threads/sync-3-4-navigation-map-update-na-2-24-now-available-with-instructions.15411/

Do you have factory Navigation?

You are way out of date. See the following link. https://www.broncosportforum.com/forum/threads/sync-3-4-build-23188-is-the-current-version.11594/ Do you have factory Navigation? What year is your vehicle?

Yes your spark plugs were past their time. However, the real cause of your stated issue was torque converter shudder which is very common with the 8F35 transmission. I have had torque converter shudder issues for the past 50,000 miles. I am currently at 162,000. Right now, the vehicle is...

So what Build of SYNC 3.4 were you on before the update? What Build are you on now? Have you done a Master Reset of SYNC? Your issues do not sound like an issue with CarPlay. If you have been running SYNC 3.4 Build 22251, you can experience all sorts of issues? Please let us know.

This must be Cincinnati speak.

I have been checking for app updates many times a day. There have been lots of updates over the last few days since iOS26 was released. Check for app updates.

What issues are you having?

Any update yet?

How would a spark plug issue cause a tachometer pulsation once a second like a clock?

A spark plug issue would not create the rhythmic pulsation showing on the tachometer. This is a torque converter shudder. Usually caused by degradation of the transmission fluid. However, a mechanical issue with the torque converter can also create this problem.

The spark plugs are not your issue. The torque converter is your issue. Try the Lubegard fix. It may save you thousands of dollars. It worked for me. Please keep us updated.

What is new is that the 2.0L version of the MPC engine was designed with both direct and port fuel injection.

Read through this thread. It sure sounds like your issue. https://www.broncosportforum.com/forum/threads/torque-converter-shudder-adventure.11649/

Source please for this statement.

Is the vehicle ruuning and parked?