[Replacing Rear Struts]

How hard is it to replace rear struts on a 93' loyale wagon?

 

Thanks

[Airflow sensor]

I have a 93' Loyale and it is bucking horribly. I had a tech run the codes and he said that I need a new airflow sensor to the tune of $700. I found an airflow meter, which I think is the same thing for $250 online. How hard are they to put in?

[loyal lugs baddddd]

I have a 93' loyale and have been told by 3 garages that the cadalytic converters are bad but I just disconnected my exhaust and it still bucks and lugs. I just tuned it up new plugs wires and cap (rotor set screw was stripped so I coudln't get it out) thinking that it might solve the lugging but it didn't . Anyone have any experience?