songguangjun

First,you must judge the fault from enginge or autotransmission.Stopping your car and the slecter lever in"p",accelerate the engine from idle to thorrotlle wide open quickly,if the engine's response is in the pink,the fault in transmission,per contra,in engine.if fault in autotranmissin,first,make a stall to judge is in torque converter or transmission interior or electronic control system.

I think that lexus or toyota cars are disigned for unleaded ganlined,so any fuel such as LPG is not suited for your car,and you do it ,the engine's performance and life will be falling!!!

I guess it's fault in torque converter.