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2002-05 Owners. As of August 2022 there is now an entire suspension kit for sale! Scroll down to the bottom of the first post click here.
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Check out this old thread and see if anything in there is helpful- https://forums.fordthunderbirdforum.com/threads/misfires-but-no-code.4131/
You may not believe this but that is NORMAL. In order to protect the engine from OVER REVING the engineers added a protection feature. When the car is not moving under load, the PCM module prevents the engine from revolving above 3000 RPM. It does it by shutting down signals to the coils in a revolving fashion. I believe that it also limits the revs while under load to 6000 rpms. again to protect the engine. Hope this explains it. It is not a problem, it is a feature.
