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Have you considered replacing the thermostat. My 91 was having the same problem, but i noticed on colder days the temp guage registered near cold. I replaced thermostat and it locks up as soon as i get on highway. Was running about 3400 rpm at 70 mph....now i run 3000 rpm at 70 mph. Saves on the gas bill. 3 more miles to the gallon highway. $3 part plus gasket and 30 mins of work. Worth a shot.
peace
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