need helpagnosing a prblem with possibly with the transmission on 1997 Dodge Caravan

i have a 1997 dodge grand caravfan es with a 3.8ltr all was well till i start having probles wth the cooling system since then the van does not like to come out of low gear. but if i turn the engine off and right back on it starts to work for a bit. i could even be driving put it in nutral turn the key off and on and put it back into gear then it works for a bit. also the check engine light is on on the dash but that may not be tied together
im thinking it's a speed sensor becaues on top og that the speedometer intermitently goes crazy soometimes it doesn't work at all and sometimes it bounces around.

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