Interesting atleast someone is thinoing bringing a Civic to OEM specs.
Bhai if you can tell us where are you from may be we can guide you to the right person.
Also some basic info is required!
1. For how you have owned this particular car and what is the scheduled maintenance?
2. Have you personally have got the suspension overhauled?
3. When were the tyres last changed?
4. What is the over all condition of the wiring?
5. Have you ever had the car scanned and compression tested? If not get it done.
6. When were the brakes serviced last time. Were the pads around changed I am assuming its four wheel disk brake.
Bhai the thing is find the instructions manual for the engine Online. You will get to know the minute details like the valve clearances, sparkplug Gap, ignition timing. The more you read and try to do it yourself will save your money, your car and you will learn.
All the issues you mentioned are easily repairable some at DIY some need an expert but can be done easily. Let us start with making the car more reliable and safe.
@nnabeel Bhai @nfssaad