V6 Blazer

2000 V6 Blazer Automatic seems to lock and unlock overdrive?

At speeds between 45 - 55 mph the tach shows rpm dropping 200-300 rpm then rising and dropping every couple minutes. This happens on level roads or a slight incline. My mechanic is hesitant to solve the problem because he can't see anything in the codes to give him an idea where to start. Mileage is 82,000 and this has been happening for at least 30,000 miles. At speeds above 60 mph there is no surging.

my answer is try to check it out first on auto repair shop..

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