1997 lexus ls400 204500 miles, engine light is on code P0340 (cam shaft position sensor bank 1), rough idle at start, once the car warms up it runs ok but loss of power, hesitates, if press more on gas pedal the car jerks. i have replaced both cam shaft position sensors and engine coolant temp sensor but no improvement. any ideas what could be the problem?

 

check the MAS to see if it is dirty they make a MAS cleaner you can buy mine did something similar and I cleaned it and works good now this may not be your problem just an idea

 

check the wiring to the CPS and grab a timing light (and check lexls iirc) to confirm that the timing is right on.

 

What's a Timing light?

 

.....google....

 

It's what we used in the good ol' days to make the cars run correctly, before computors.

 

Sounds like the TPS sensor which stands for throttle position sensor

 

Where is TPS located at?

 

Are you kidding me? Does everyone not know how to SEARCH? http://www.lexls.com/tutorials/EFI/tps.html
Throttle = fuel. Fuel = Throttle body. = Throttle position sensor. In the future try searching before asking.

 

Yep I would say if you don't know what a timing light is or where the tps is, you should either do a bunch of studying or go and fine a mechanic, or you risk frigging something up.

 

I'm not a mechanic, just wanted to get some info.

 

here is a youtube video link of how the car sounds...
http://www.youtube.com/watch?v=LgRYf-guWgg

 

God bless computorized translation. Need a translator for the translator.

 

code is P0340 camshaft position sensor which has already been replaced) , anyone has any suggestions?

 

I would go with the suggestion already mentioned by PureDrifter "check the wiring to the CPS and grab a timing light (and check lexls iirc) to confirm that the timing is right on." If the timing is off just by a tick, it could throw a CPS code. If the wiring connections are all plugged in and the wires aren't cut somewhere then maybe there's a problem with the ECU.