Code P0303 engine misfire

I'm there with the car now. I have just verified the timing and it seems it have jumped timing by a tooth.
Additionally, when I checked for codes today more codes came up.

As you rightly said the belt was still intact however the timing was off. It seems as if it keeps jumping timing.
In addition, I was sniffing a strong fuel odor from the exhaust when the car was idling so I can scan for codes. Sorry I didn't include that on the details of the car problem initially. After timing work the fuel odor wasn't too strong as before.
I have reset the timing of the car. Now this is the present state of the car after the timing work.

First, I want to apologize for not responding promptly to the guide you provided to help me fix that car problem!
It was due to the man's action that prevented me from taking the steps.
Before I proceeded to check the injectors, I noticed that the inner COP connector wasn't contacting properly. So
I connected it well as it should. Immediately, he invited someone else to come over and fix the car while I was still working.
Well, when the mechanic came, he told him that the fuel pump should be replaced, that it is faulty without conducting any test. I told them that it is likely something else, that's going to be the injectors. I was not allowed to check the injectors. It was late so we both departed.
About a week later he invited a different mechanic from somewhere else to come and check the car. I was called to fix a car very close by, I noticed that the mechanic that he called to fix is car couldn't still fix the problem, so he left. I didn't understand the man's action, hence, I gave up doing what you advised me to check.