1992 4Runner, V6, 5 speed, 170K. It Starts and accelerates easy, but at 25 to 35 MPH it does not run smoothly. It jerks badly, if I step on the gas it will accelerate smoothly right on up. It is just when IÆm trying to maintain an even speed around 1500 to 2000 rpm. IÆve checked for obvious vacuum leaks and can find none. Any and all ideas will be appreciated. Thanks, PeterY