Engine codes what to check?
 

Here are my codes

12 Throttle sensor -full
18 throttle sensor -narrow
40 Solenoid valve purge control
50 Solenoid valve double throttle

I'm not sure "exactly" where to check for these things. I'm in the process of doing the vacuum simplifications for the poor man's non sequential set up. What should I check on the throttle sensor and where can I find a diagram with good explaination of where all these parts are located.

Thanks!