2000 Pontiac Sunfire fuel system problems

For my car being a 2000, I have had more than enough problems with this car. For starters, I had a defect in the side window on the drivers back side, I had the line the antifreeze runs through replaced due to a hole being burnt through if from the battery, I had the molding in my passengers side door fixed twice, then I had a problem with my lights inside and outside not coming on, so the switch was replaced, and that wasnt the problem so then it was back a second time, and the computer was replaced, then they…

My car was driving perfect until 3 weeks ago, it has since then wont start back up. Thought it was something to do with spark, then tried spark plug wires, new battery, checked alternator and fuses, coils all good. Then I was lead to maybe the gas that was in it. Dropped gas tank, put new fuel filter, checked fuel pump, gas lines, it did stay running one time since but was shaking roughly with a flashing check engine light. Will not run anymore since then.