2004 base with a manual and 90k miles. Only issue right now is the fuel system burp when filling the tank combined with a slow fuel system air leak that occasionally throws the check engine light. Im guessing they’re related and have thrown a few parts at it but haven’t gotten it to go away.

I don’t have a lift or even a garage but I do have a private driveway and a fair number of tools so as long as it can be done with jack stands in a weekend it’s in the realm of something I can do. 

Already done:  
\- IMS bearing was already done according to imscheck.com.    
\- Basic fluid flushes have been done with the exception of the clutch which I will do next time I do the oil and have it on jackstands.   
\- Motor mount replaced but the vibration came back after a month or two so I want to check it again… when I’m back under it. 

Anything can do with the top?   Can I grease the gears to keep them from breaking or is that just a time thing?  I basically live with the top down as long as it isn’t raining. 

Suspension?  I’ve actually never done anything with suspension on any of my cars. 

Spark plugs?  I have no indications they need to be done but I have no idea when they were last done if ever.  

Other?  The car doesn’t leak anywhere (something the PPI called out when I bought it as being in excellent mechanical health) so I hesitate to crack any seals if I don’t need to. 

I bought the car just for fun. Something to drive around while I’m in town as I travel a lot. That said I’ve fallen in love with it more than I expected… and now I really want to keep it in top condition. 

What preventative maintenance would you do?