Why does my car shake?

Timming belt was changed but had a oil leake after that. (Didn't have one before). I put oil in the car because I assumed it was low and right after I put Arco gas in it(was running on empty). Right after doing this the car started to shake and felt like it was going to turn off. Check engine light began to blink, battery light would kinda light up. I would reive the engine and it would be fine. This happens only when I have the car at a stop or light.

It's a Honda Civic 2004.

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