Help on these items please.

[AndyR]

Hi all, my 1.6 16v astra g is giving me grief, very hesitant when pulling away, but will accelarate well. But won't cruise without being somewhat jerky, like its not getting fuel constantly.  

Firstly how do I remove air mass sensor(see picture), and secondly, what is this that seems connected to the throttle body (see third picture). 

Thanks in advance.  

Andy.