Rep Power: 0

94 honda civic dx single cam:manual:160k miles
------wher do i begin. well mainly is how can i ensure "longevity" to my car?
1. i replaced the clutch, radiator flush, oil change. standard.
----what else that i need to know will be highly recommended.

-------also recently, i started to smell "gas" like from inside my car. then few days later i wasnt able to drive my car normally. 5speed manual, i couldnt get it to rev high enough in gear 2 to even go over a little hill. ..im hoping i didnt burn my clutch already. but idk wats going on.
BUT MOST importantly , what are the things to keep in mind and religiously do to maintain my eg?

 
Rep Power: 367

Your question is widely broad...
if you plan on doing yourself, start getting a service manual:
https://www.civicforums.com/forums/1...s-manuals.html
also, consult the stickies in the top of each forum...
Engine:
https://www.civicforums.com/forums/7...e-up-mods.html
Suspension:
https://www.civicforums.com/forums/4...ease-read.html
etc, etc, etc.
Use the search buttom on the top to find something you need.
Read, read, read.
when you find a specific question, ask again.
Did you change spark plugs?