When stepping into it between 3rd and 4th gears, it flattens out or looses power. It only does this after it reaches 4th gear. throttle spring, maybe? Has a thm200c transmission. Or maybe the governor ball has a flat spot on it?Related Questionsbuick lesabredriving and lost power just like turning off the key,would not start again replaced crankshaft position scencor.still no spark2004 Buick LesabreIs the ABS and TC sensor one and the same?1995 buick lesabreI swapped out AC comp with bypass pulley, and I now have no heater blower motor. Do I need to jump wiring from comp?