Little or no power while in drive

[CorrosiveSmoke]

I have a 2000 lexus es300 at 136000miles in park or neutral I can rev the car up just fine but when I put it into gear the rpm barely creeps along even with my food to the floor, it gets a little bit better after the car is warmed up but not by much It still takes a minute for it to wind up enough rpm to start accelerating, I know it needs a couple knock sensors. I'm running some Chevron Techron Fuel System Cleaner through it now. any advice could it be the evap canister or pcv?

[lenore]

First welcome aboard, do you have any codes or check engine light?  If so the knock sensors will cause the engine to run in limp mode.  They have to be repaired.  Tech cleaner will not fix your problem.