when i am driving on the freeway and cruising at between 70 and 80 closer to 80, i can feel my car's rpm going from 1.5 to 3 ad fluctuating quite often , this also happens from 50 to 60, what does this mean, i know that the shifts from 2 to 3 and 3 to 4th are there but it's like more of a jerk!
should i be worried or am i just paranoid

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2000 TL, Satin Silver, Burlwood shifter, Fog light ports, front air dam, grill and mud gaurds custom painted to match car! 18" Alba Blaze with 235/40ZR18 Toyo Proxes F4

 

took my car in on friday at 7:30 , i called the service manager and he met me up there, and i explained the problem to him and he said it sounds like the ecu(computer) and not the trans, so they are going to replace it!!

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2000 TL, Satin Silver, Burlwood shifter, Fog light ports, front air dam, grill and mud gaurds custom painted to match car! 18" Alba Blaze with 235/40ZR18 Toyo Proxes F4