My engine ir reving, and jerking. Do I need a new transmission. on 2000 Lexus RX300

My car is reving and jerking. No matter how much I pressed on the gas the car would go no more than 20 miles and hour, and if I tried to go faster the car would almost stock and the enging reved like I was just sitting still. I pulled into the driveway, put the car in reverse to back up, and then put the car in drive and it continued to go in reverse.

Asked by for the 2000 Lexus RX300
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2 more answers
Either a transmission problem or....hopefully the transmission position sensor is all that needs replaced (TPS sensor) Either way you will probably need a diagnostic done at a trans. shop.
My car is slow starting. I recently had a new battery, but it is still slow starting. I have to press the key hard into the ignition and after several trys it will start. I have haD A sensor replaced and a tune up, butI am still having a slow start problem.