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They did not* I changed the plugs yesterday and they were covered in carbon but definitely not terrible. Since the transmission flush, torque converter stabilizer, and now spark plug replacement the car has been driving much smoother. I don't know if this is more of a bandaid than a repair but...

So turns out the transmission fluid flush and stabilizer worked but now we're also having rear dif issues. I love it

They did supply us with any previous records

Once we go pick it up from the repair shop I plan on grabbing the spark plugs and replacing those while we price out a rear dif replacement

So we bought the car at 78k miles! But I understand where your concerns are coming from.

Just got the call from the repair shop. They flushed the transmission fluid twice then added the stuff from your post. The car is still having the shudder so they did more digging and found that the issue is coming from the rear differential. We're waiting on a quote from a Ford dealership since...

Not yet, I had plans to swap those out this weekend since I didn't want to pay $600 for them to do it

For months now my engine has been having a strange issue. Anytime any amount of throttle is applied (even by cruise control) the RPMs will jump up and down a few hundred RPMs almost once every second. This happens at any speed, regardless of gear or if we are manually applying throttle or if...