My guess is that the pinch roller is either dirty or dried out and not controlling the speed. On tape decks, the speed is controlled by the capstan (thin metal axel) spinning at the correct rate and the pinch roller (rubber wheel) that presses the tape to the capstan. Most cleaning products don't clean the pinch roller very well as the focus on the metal parts. A q-tip and tape cleaner is usualy pretty effective but access is the big problem especially in a car.
mc-ca is on the right track with that one.
If you can get a wooden stick q-tip and some alcohol, just hold open the door flap and get a flashlight and clean the capstan and rubber wheel real well with the alcohol moistened tip.
I've tried this before on the same problem and it fixed it in my case.
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