I noticed my engine struggles to turn-over and sometimes shakes in the morning when I start it and after revving couple of times it's gone; never had that problem before when I got it. So what I did is change the tranny fluid and oil, replaced the sparkplugs, air filter, fuel filter and had the fuel injectors cleaned. It's running better but has the same problem. Some people said it's probably a fuel I've been using and some said it's normal for an older car with high kms. I have a 95 Honda Civic Hatback with 274,000 kms...
Anyone have any idea what I'm dealing with?

. Try cleaning the throttle plate, throttle body, and IACV:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-7.html#post1054149

. Replace the Ignition Control Module (ICM) and coil, if the problem persists:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-4.html#post265896

Only use NGK plugs in your Civic.

Cleaned the throttle body and plate and IACV, there was a little bit of oil in it... is that normal for older cars? I put a new distributor again just in case. The shaking stopped for few months then came back. I noticed that it only happens when the engine is cold and idle then its gone...