Looking for some insight. Does anyone have an idea what I should try 1st to fix this issue. The vehicle also chugs on the freeway when I get to about 60mph, tach goes from 2.5k to 3.5k and revs. I have 104k miles on the car and have meticulously maintained maintenance. Any help would be appreciated (PS I work on my car, but I'm not a car junky, so dumbed down english will be better than tech'y talk).