99 Es300 Fault Codes P0330,p0325,p0441,p0446

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my es300 has about 107,000 runs great ..but the check engine light on

scan the codes and this is what came up ...

p0330 knock senor 2 curcuit 2

p0325 knock senor 1 circuit

p0441 eva system incorrect purge flow

p0446 eva emission system vent control circuit

i search all over and it seems i have 2 bad knock senors ...

and the fuel evaporative system ......

how should i go about fixing this should i get the 2 knock senors change first

..or deal with the fuel evaporative syetem ...

what can i change there first

gas cap ?

or the whole cannister .. or what part ...

one more thing is there a site where i can buy a shop manuel ....not hanyes

a real one ..cause i dont know where nottings at ?i been looking around this site and found the 97 fsm and it looks like most of the componets are under the hood ....as far as the knock sensors is that a hard jod to do ...is it stright fwd do i need to drain anything ..or replace any seals ...

any help will be great thanks